Pulling user experiment code from BrowserDistribution to a new class.

chrome/installer/util/google_chrome_distribution.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 //
 // This file defines specific implementation of BrowserDistribution class for
 // Google Chrome.
 
 #include "chrome/installer/util/google_chrome_distribution.h"
 
 #include <windows.h>
 #include <msi.h>
-#include <sddl.h>
-#include <wtsapi32.h>
-#include <vector>
 
-#include "base/command_line.h"
 #include "base/files/file_path.h"
 #include "base/json/json_file_value_serializer.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/path_service.h"
-#include "base/process_util.h"
-#include "base/rand_util.h"
 #include "base/string_util.h"
 #include "base/stringprintf.h"
-#include "base/strings/string_number_conversions.h"
-#include "base/strings/string_split.h"
 #include "base/utf_string_conversions.h"
 #include "base/win/registry.h"
 #include "base/win/windows_version.h"
-#include "chrome/common/attrition_experiments.h"
-#include "chrome/common/chrome_result_codes.h"
-#include "chrome/common/chrome_switches.h"
 #include "chrome/common/net/test_server_locations.h"
 #include "chrome/common/pref_names.h"
 #include "chrome/installer/util/channel_info.h"
 #include "chrome/installer/util/google_update_constants.h"
 #include "chrome/installer/util/google_update_settings.h"
 #include "chrome/installer/util/helper.h"
 #include "chrome/installer/util/install_util.h"
 #include "chrome/installer/util/l10n_string_util.h"
-#include "chrome/installer/util/product.h"
 #include "chrome/installer/util/util_constants.h"
 #include "chrome/installer/util/wmi.h"
 #include "content/public/common/result_codes.h"
 
 #include "installer_util_strings.h"  // NOLINT
 
-#pragma comment(lib, "wtsapi32.lib")
-
 namespace {
 
 const wchar_t kChromeGuid[] = L"{8A69D345-D564-463c-AFF1-A69D9E530F96}";
 const wchar_t kBrowserAppId[] = L"Chrome";
 const wchar_t kCommandExecuteImplUuid[] =
     L"{5C65F4B0-3651-4514-B207-D10CB699B14B}";
 
-// The following strings are the possible outcomes of the toast experiment
-// as recorded in the |client| field.
-const wchar_t kToastExpControlGroup[] =        L"01";
-const wchar_t kToastExpCancelGroup[] =         L"02";
-const wchar_t kToastExpUninstallGroup[] =      L"04";
-const wchar_t kToastExpTriesOkGroup[] =        L"18";
-const wchar_t kToastExpTriesErrorGroup[] =     L"28";
-const wchar_t kToastActiveGroup[] =            L"40";
-const wchar_t kToastUDDirFailure[] =           L"40";
-const wchar_t kToastExpBaseGroup[] =           L"80";
-
 // Substitute the locale parameter in uninstall URL with whatever
 // Google Update tells us is the locale. In case we fail to find
 // the locale, we use US English.
 string16 LocalizeUrl(const wchar_t* url) {
   string16 language;
   if (!GoogleUpdateSettings::GetLanguage(&language))
     language = L"en-US";  // Default to US English.
   return ReplaceStringPlaceholders(url, language.c_str(), NULL);
 }
 
 string16 GetUninstallSurveyUrl() {
   const wchar_t kSurveyUrl[] = L"http://www.google.com/support/chrome/bin/"
                                L"request.py?hl=$1&contact_type=uninstall";
   return LocalizeUrl(kSurveyUrl);
 }
 
-string16 GetWelcomeBackUrl() {
-  const wchar_t kWelcomeUrl[] = L"http://www.google.com/chrome/intl/$1/"
-                                L"welcomeback-new.html";
-  return LocalizeUrl(kWelcomeUrl);
-}
-
-// Converts FILETIME to hours. FILETIME times are absolute times in
-// 100 nanosecond units. For example 5:30 pm of June 15, 2009 is 3580464.
-int FileTimeToHours(const FILETIME& time) {
-  const ULONGLONG k100sNanoSecsToHours = 10000000LL * 60 * 60;
-  ULARGE_INTEGER uli = {time.dwLowDateTime, time.dwHighDateTime};
-  return static_cast<int>(uli.QuadPart / k100sNanoSecsToHours);
-}
-
-// Returns the directory last write time in hours since January 1, 1601.
-// Returns -1 if there was an error retrieving the directory time.
-int GetDirectoryWriteTimeInHours(const wchar_t* path) {
-  // To open a directory you need to pass FILE_FLAG_BACKUP_SEMANTICS.
-  DWORD share = FILE_SHARE_READ | FILE_SHARE_WRITE | FILE_SHARE_DELETE;
-  HANDLE file = ::CreateFileW(path, 0, share, NULL, OPEN_EXISTING,
-                              FILE_FLAG_BACKUP_SEMANTICS, NULL);
-  if (INVALID_HANDLE_VALUE == file)
-    return -1;
-  FILETIME time;
-  if (!::GetFileTime(file, NULL, NULL, &time)) {
-    ::CloseHandle(file);
-    return -1;
-  }
-
-  ::CloseHandle(file);
-  return FileTimeToHours(time);
-}
-
-// Returns the directory last-write time age in hours, relative to current
-// time, so if it returns 14 it means that the directory was last written 14
-// hours ago. Returns -1 if there was an error retrieving the directory.
-int GetDirectoryWriteAgeInHours(const wchar_t* path) {
-  int dir_time = GetDirectoryWriteTimeInHours(path);
-  if (dir_time < 0)
-    return dir_time;
-  FILETIME time;
-  GetSystemTimeAsFileTime(&time);
-  int now_time = FileTimeToHours(time);
-  if (dir_time >= now_time)
-    return 0;
-  return (now_time - dir_time);
-}
-
-// Launches setup.exe (located at |setup_path|) with |cmd_line|.
-// If system_level_toast is true, appends --system-level-toast.
-// If handle to experiment result key was given at startup, re-add it.
-// Does not wait for the process to terminate.
-// |cmd_line| may be modified as a result of this call.
-bool LaunchSetup(CommandLine* cmd_line,
-                 const installer::Product& product,
-                 bool system_level_toast) {
-  const CommandLine& current_cmd_line = *CommandLine::ForCurrentProcess();
-
-  // Propagate --verbose-logging to the invoked setup.exe.
-  if (current_cmd_line.HasSwitch(installer::switches::kVerboseLogging))
-    cmd_line->AppendSwitch(installer::switches::kVerboseLogging);
-
-  // Pass along product-specific options.
-  product.AppendProductFlags(cmd_line);
-
-  // Re-add the system level toast flag.
-  if (system_level_toast) {
-    cmd_line->AppendSwitch(installer::switches::kSystemLevel);
-    cmd_line->AppendSwitch(installer::switches::kSystemLevelToast);
-
-    // Re-add the toast result key. We need to do this because Setup running as
-    // system passes the key to Setup running as user, but that child process
-    // does not perform the actual toasting, it launches another Setup (as user)
-    // to do so. That is the process that needs the key.
-    std::string key(installer::switches::kToastResultsKey);
-    std::string toast_key = current_cmd_line.GetSwitchValueASCII(key);
-    if (!toast_key.empty()) {
-      cmd_line->AppendSwitchASCII(key, toast_key);
-
-      // Use handle inheritance to make sure the duplicated toast results key
-      // gets inherited by the child process.
-      base::LaunchOptions options;
-      options.inherit_handles = true;
-      return base::LaunchProcess(*cmd_line, options, NULL);
-    }
-  }
-
-  return base::LaunchProcess(*cmd_line, base::LaunchOptions(), NULL);
-}
-
-// For System level installs, setup.exe lives in the system temp, which
-// is normally c:\windows\temp. In many cases files inside this folder
-// are not accessible for execution by regular user accounts.
-// This function changes the permissions so that any authenticated user
-// can launch |exe| later on. This function should only be called if the
-// code is running at the system level.
-bool FixDACLsForExecute(const base::FilePath& exe) {
-  // The general strategy to is to add an ACE to the exe DACL the quick
-  // and dirty way: a) read the DACL b) convert it to sddl string c) add the
-  // new ACE to the string d) convert sddl string back to DACL and finally
-  // e) write new dacl.
-  char buff[1024];
-  DWORD len = sizeof(buff);
-  PSECURITY_DESCRIPTOR sd = reinterpret_cast<PSECURITY_DESCRIPTOR>(buff);
-  if (!::GetFileSecurityW(exe.value().c_str(), DACL_SECURITY_INFORMATION,
-                          sd, len, &len)) {
-    return false;
-  }
-  wchar_t* sddl = 0;
-  if (!::ConvertSecurityDescriptorToStringSecurityDescriptorW(sd,
-      SDDL_REVISION_1, DACL_SECURITY_INFORMATION, &sddl, NULL))
-    return false;
-  string16 new_sddl(sddl);
-  ::LocalFree(sddl);
-  sd = NULL;
-  // See MSDN for the  security descriptor definition language (SDDL) syntax,
-  // in our case we add "A;" generic read 'GR' and generic execute 'GX' for
-  // the nt\authenticated_users 'AU' group, that becomes:
-  const wchar_t kAllowACE[] = L"(A;;GRGX;;;AU)";
-  // We should check that there are no special ACES for the group we
-  // are interested, which is nt\authenticated_users.
-  if (string16::npos != new_sddl.find(L";AU)"))
-    return false;
-  // Specific ACEs (not inherited) need to go to the front. It is ok if we
-  // are the very first one.
-  size_t pos_insert = new_sddl.find(L"(");
-  if (string16::npos == pos_insert)
-    return false;
-  // All good, time to change the dacl.
-  new_sddl.insert(pos_insert, kAllowACE);
-  if (!::ConvertStringSecurityDescriptorToSecurityDescriptorW(new_sddl.c_str(),
-      SDDL_REVISION_1, &sd, NULL))
-    return false;
-  bool rv = ::SetFileSecurityW(exe.value().c_str(), DACL_SECURITY_INFORMATION,
-                               sd) == TRUE;
-  ::LocalFree(sd);
-  return rv;
-}
-
-// This function launches setup as the currently logged-in interactive
-// user that is the user whose logon session is attached to winsta0\default.
-// It assumes that currently we are running as SYSTEM in a non-interactive
-// windowstation.
-// The function fails if there is no interactive session active, basically
-// the computer is on but nobody has logged in locally.
-// Remote Desktop sessions do not count as interactive sessions; running this
-// method as a user logged in via remote desktop will do nothing.
-bool LaunchSetupAsConsoleUser(const base::FilePath& setup_path,
-                              const installer::Product& product,
-                              const std::string& flag) {
-  CommandLine cmd_line(setup_path);
-  cmd_line.AppendSwitch(flag);
-
-  // Pass along product-specific options.
-  product.AppendProductFlags(&cmd_line);
-
-  // Convey to the invoked setup.exe that it's operating on a system-level
-  // installation.
-  cmd_line.AppendSwitch(installer::switches::kSystemLevel);
-
-  // Propagate --verbose-logging to the invoked setup.exe.
-  if (CommandLine::ForCurrentProcess()->HasSwitch(
-          installer::switches::kVerboseLogging)) {
-    cmd_line.AppendSwitch(installer::switches::kVerboseLogging);
-  }
-
-  // Get the Google Update results key, and pass it on the command line to
-  // the child process.
-  int key = GoogleUpdateSettings::DuplicateGoogleUpdateSystemClientKey();
-  cmd_line.AppendSwitchASCII(installer::switches::kToastResultsKey,
-                             base::IntToString(key));
-
-  if (base::win::GetVersion() > base::win::VERSION_XP) {
-    // Make sure that in Vista and Above we have the proper DACLs so
-    // the interactive user can launch it.
-    if (!FixDACLsForExecute(setup_path))
-      NOTREACHED();
-  }
-
-  DWORD console_id = ::WTSGetActiveConsoleSessionId();
-  if (console_id == 0xFFFFFFFF) {
-    PLOG(ERROR) << __FUNCTION__ << " failed to get active session id";
-    return false;
-  }
-  HANDLE user_token;
-  if (!::WTSQueryUserToken(console_id, &user_token)) {
-    PLOG(ERROR) << __FUNCTION__ << " failed to get user token for console_id "
-                << console_id;
-    return false;
-  }
-  // Note: Handle inheritance must be true in order for the child process to be
-  // able to use the duplicated handle above (Google Update results).
-  base::LaunchOptions options;
-  options.as_user = user_token;
-  options.inherit_handles = true;
-  options.empty_desktop_name = true;
-  VLOG(1) << __FUNCTION__ << " launching " << cmd_line.GetCommandLineString();
-  bool launched = base::LaunchProcess(cmd_line, options, NULL);
-  ::CloseHandle(user_token);
-  VLOG(1) << __FUNCTION__ << "   result: " << launched;
-  return launched;
-}
-
 }  // namespace
 
 GoogleChromeDistribution::GoogleChromeDistribution()
     : BrowserDistribution(CHROME_BROWSER),
       product_guid_(kChromeGuid) {
 }
 
 bool GoogleChromeDistribution::BuildUninstallMetricsString(
     const DictionaryValue* uninstall_metrics_dict, string16* metrics) {
   DCHECK(NULL != metrics);
@@ skipping 265 matching lines @@
 // string (if it is present) regardless of whether installer failed or not.
 // There is no fall-back for full installer :)
 void GoogleChromeDistribution::UpdateInstallStatus(bool system_install,
     installer::ArchiveType archive_type,
     installer::InstallStatus install_status) {
   GoogleUpdateSettings::UpdateInstallStatus(system_install,
       archive_type, InstallUtil::GetInstallReturnCode(install_status),
       product_guid());
 }
 
-// A helper function that writes to HKLM if the handle was passed through the
-// command line, but HKCU otherwise. |experiment_group| is the value to write
-// and |last_write| is used when writing to HKLM to determine whether to close
-// the handle when done.
-void SetClient(const string16& experiment_group, bool last_write) {
-  static int reg_key_handle = -1;
-  if (reg_key_handle == -1) {
-    // If a specific Toast Results key handle (presumably to our HKLM key) was
-    // passed in to the command line (such as for system level installs), we use
-    // it. Otherwise, we write to the key under HKCU.
-    const CommandLine& cmd_line = *CommandLine::ForCurrentProcess();
-    if (cmd_line.HasSwitch(installer::switches::kToastResultsKey)) {
-      // Get the handle to the key under HKLM.
-      base::StringToInt(cmd_line.GetSwitchValueASCII(
-          installer::switches::kToastResultsKey).c_str(),
-          &reg_key_handle);
-    } else {
-      reg_key_handle = 0;
-    }
-  }
-
-  if (reg_key_handle) {
-    // Use it to write the experiment results.
-    GoogleUpdateSettings::WriteGoogleUpdateSystemClientKey(
-        reg_key_handle, google_update::kRegClientField, experiment_group);
-    if (last_write)
-      CloseHandle((HANDLE) reg_key_handle);
-  } else {
-    // Write to HKCU.
-    GoogleUpdateSettings::SetClient(experiment_group);
-  }
-}
-
-bool GoogleChromeDistribution::GetExperimentDetails(
-    UserExperiment* experiment, int flavor) {
-  struct FlavorDetails {
-    int heading_id;
-    int flags;
-  };
-  // Maximum number of experiment flavors we support.
-  static const int kMax = 4;
-  // This struct determines which experiment flavors we show for each locale and
-  // brand.
-  //
-  // Plugin infobar experiment:
-  // The experiment in 2011 used PIxx codes.
-  //
-  // Inactive user toast experiment:
-  // The experiment in Dec 2009 used TGxx and THxx.
-  // The experiment in Feb 2010 used TKxx and TLxx.
-  // The experiment in Apr 2010 used TMxx and TNxx.
-  // The experiment in Oct 2010 used TVxx TWxx TXxx TYxx.
-  // The experiment in Feb 2011 used SJxx SKxx SLxx SMxx.
-  // The experiment in Mar 2012 used ZAxx ZBxx ZCxx.
-  // The experiment in Jan 2013 uses DAxx.
-  using namespace attrition_experiments;
-
-  static const struct UserExperimentDetails {
-    const wchar_t* locale;  // Locale to show this experiment for (* for all).
-    const wchar_t* brands;  // Brand codes show this experiment for (* for all).
-    int control_group;      // Size of the control group, in percentages.
-    const wchar_t* prefix;  // The two letter experiment code. The second letter
-                            // will be incremented with the flavor.
-    FlavorDetails flavors[kMax];
-  } kExperiments[] = {
-    // The first match from top to bottom is used so this list should be ordered
-    // most-specific rule first.
-    { L"*", L"GGRV",  // All locales, GGRV is enterprise.
-      0,              // 0 percent control group.
-      L"EA",          // Experiment is EAxx, EBxx, etc.
-      // No flavors means no experiment.
-      { { 0, 0 },
-        { 0, 0 },
-        { 0, 0 },
-        { 0, 0 }
-      }
-    },
-    { L"*", L"*",     // All locales, all brands.
-      5,              // 5 percent control group.
-      L"DA",          // Experiment is DAxx.
-      // One single flavor.
-      { { IDS_TRY_TOAST_HEADING3, kMakeDefault },
-        { 0, 0 },
-        { 0, 0 },
-        { 0, 0 }
-      }
-    }
-  };
-
-  string16 locale;
-  GoogleUpdateSettings::GetLanguage(&locale);
-  if (locale.empty() || (locale == ASCIIToWide("en")))
-    locale = ASCIIToWide("en-US");
-
-  string16 brand;
-  if (!GoogleUpdateSettings::GetBrand(&brand))
-    brand = ASCIIToWide("");  // Could still be viable for catch-all rules.
-
-  for (int i = 0; i < arraysize(kExperiments); ++i) {
-    if (kExperiments[i].locale != locale &&
-        kExperiments[i].locale != ASCIIToWide("*"))
-      continue;
-
-    std::vector<string16> brand_codes;
-    base::SplitString(kExperiments[i].brands, L',', &brand_codes);
-    if (brand_codes.empty())
-      return false;
-    for (std::vector<string16>::iterator it = brand_codes.begin();
-         it != brand_codes.end(); ++it) {
-      if (*it != brand && *it != L"*")
-        continue;
-      // We have found our match.
-      const UserExperimentDetails& match = kExperiments[i];
-      // Find out how many flavors we have. Zero means no experiment.
-      int num_flavors = 0;
-      while (match.flavors[num_flavors].heading_id) { ++num_flavors; }
-      if (!num_flavors)
-        return false;
-
-      if (flavor < 0)
-        flavor = base::RandInt(0, num_flavors - 1);
-      experiment->flavor = flavor;
-      experiment->heading = match.flavors[flavor].heading_id;
-      experiment->control_group = match.control_group;
-      const wchar_t prefix[] = { match.prefix[0], match.prefix[1] + flavor, 0 };
-      experiment->prefix = prefix;
-      experiment->flags = match.flavors[flavor].flags;
-      return true;
-    }
-  }
-
-  return false;
-}
-
-// Currently we only have one experiment: the inactive user toast. Which only
-// applies for users doing upgrades.
-
-//
-// There are three scenarios when this function is called:
-// 1- Is a per-user-install and it updated: perform the experiment
-// 2- Is a system-install and it updated : relaunch as the interactive user
-// 3- It has been re-launched from the #2 case. In this case we enter
-//    this function with |system_install| true and a REENTRY_SYS_UPDATE status.
-void GoogleChromeDistribution::LaunchUserExperiment(
-    const base::FilePath& setup_path, installer::InstallStatus status,
-    const Version& version, const installer::Product& product,
-    bool system_level) {
-  VLOG(1) << "LaunchUserExperiment status: " << status << " product: "
-          << product.distribution()->GetAppShortCutName()
-          << " system_level: " << system_level;
-
-  if (system_level) {
-    if (installer::NEW_VERSION_UPDATED == status) {
-      // We need to relaunch as the interactive user.
-      LaunchSetupAsConsoleUser(setup_path, product,
-                               installer::switches::kSystemLevelToast);
-      return;
-    }
-  } else {
-    if ((installer::NEW_VERSION_UPDATED != status) &&
-        (installer::REENTRY_SYS_UPDATE != status)) {
-      // We are not updating or in re-launch. Exit.
-      return;
-    }
-  }
-
-  // The |flavor| value ends up being processed by TryChromeDialogView to show
-  // different experiments.
-  UserExperiment experiment;
-  if (!GetExperimentDetails(&experiment, -1)) {
-    VLOG(1) << "Failed to get experiment details.";
-    return;
-  }
-  int flavor = experiment.flavor;
-  string16 base_group = experiment.prefix;
-
-  string16 brand;
-  if (GoogleUpdateSettings::GetBrand(&brand) && (brand == L"CHXX")) {
-    // Testing only: the user automatically qualifies for the experiment.
-    VLOG(1) << "Experiment qualification bypass";
-  } else {
-    // Check that the user was not already drafted in this experiment.
-    string16 client;
-    GoogleUpdateSettings::GetClient(&client);
-    if (client.size() > 2) {
-      if (base_group == client.substr(0, 2)) {
-        VLOG(1) << "User already participated in this experiment";
-        return;
-      }
-    }
-    // Check browser usage inactivity by the age of the last-write time of the
-    // most recently-used chrome user data directory.
-    std::vector<base::FilePath> user_data_dirs;
-    product.GetUserDataPaths(&user_data_dirs);
-    int dir_age_hours = -1;
-    for (size_t i = 0; i < user_data_dirs.size(); ++i) {
-      int this_age = GetDirectoryWriteAgeInHours(
-          user_data_dirs[i].value().c_str());
-      if (this_age >= 0 && (dir_age_hours < 0 || this_age < dir_age_hours))
-        dir_age_hours = this_age;
-    }
-
-    const bool experiment_enabled = false;
-    const int kThirtyDays = 30 * 24;
-
-    if (!experiment_enabled) {
-      VLOG(1) << "Toast experiment is disabled.";
-      return;
-    } else if (dir_age_hours < 0) {
-      // This means that we failed to find the user data dir. The most likely
-      // cause is that this user has not ever used chrome at all which can
-      // happen in a system-level install.
-      SetClient(base_group + kToastUDDirFailure, true);
-      return;
-    } else if (dir_age_hours < kThirtyDays) {
-      // An active user, so it does not qualify.
-      VLOG(1) << "Chrome used in last " << dir_age_hours << " hours";
-      SetClient(base_group + kToastActiveGroup, true);
-      return;
-    }
-    // Check to see if this user belongs to the control group.
-    double control_group = 1.0 * (100 - experiment.control_group) / 100;
-    if (base::RandDouble() > control_group) {
-      SetClient(base_group + kToastExpControlGroup, true);
-      VLOG(1) << "User is control group";
-      return;
-    }
-  }
-
-  VLOG(1) << "User drafted for toast experiment " << flavor;
-  SetClient(base_group + kToastExpBaseGroup, false);
-  // User level: The experiment needs to be performed in a different process
-  // because google_update expects the upgrade process to be quick and nimble.
-  // System level: We have already been relaunched, so we don't need to be
-  // quick, but we relaunch to follow the exact same codepath.
-  CommandLine cmd_line(setup_path);
-  cmd_line.AppendSwitchASCII(installer::switches::kInactiveUserToast,
-                             base::IntToString(flavor));
-  cmd_line.AppendSwitchASCII(installer::switches::kExperimentGroup,
-                             WideToASCII(base_group));
-  LaunchSetup(&cmd_line, product, system_level);
-}
-
-// User qualifies for the experiment. To test, use --try-chrome-again=|flavor|
-// as a parameter to chrome.exe.
-void GoogleChromeDistribution::InactiveUserToastExperiment(int flavor,
-    const string16& experiment_group,
-    const installer::Product& installation,
-    const base::FilePath& application_path) {
-  // Add the 'welcome back' url for chrome to show.
-  CommandLine options(CommandLine::NO_PROGRAM);
-  options.AppendSwitchNative(switches::kTryChromeAgain,
-      base::IntToString16(flavor));
-  // Prepend the url with a space.
-  string16 url(GetWelcomeBackUrl());
-  options.AppendArg("--");
-  options.AppendArgNative(url);
-  // The command line should now have the url added as:
-  // "chrome.exe -- <url>"
-  DCHECK_NE(string16::npos,
-      options.GetCommandLineString().find(L" -- " + url));
-
-  // Launch chrome now. It will show the toast UI.
-  int32 exit_code = 0;
-  if (!installation.LaunchChromeAndWait(application_path, options, &exit_code))
-    return;
-
-  // The chrome process has exited, figure out what happened.
-  const wchar_t* outcome = NULL;
-  switch (exit_code) {
-    case content::RESULT_CODE_NORMAL_EXIT:
-      outcome = kToastExpTriesOkGroup;
-      break;
-    case chrome::RESULT_CODE_NORMAL_EXIT_CANCEL:
-      outcome = kToastExpCancelGroup;
-      break;
-    case chrome::RESULT_CODE_NORMAL_EXIT_EXP2:
-      outcome = kToastExpUninstallGroup;
-      break;
-    default:
-      outcome = kToastExpTriesErrorGroup;
-  };
-  // Write to the |client| key for the last time.
-  SetClient(experiment_group + outcome, true);
-
-  if (outcome != kToastExpUninstallGroup)
-    return;
-  // The user wants to uninstall. This is a best effort operation. Note that
-  // we waited for chrome to exit so the uninstall would not detect chrome
-  // running.
-  bool system_level_toast = CommandLine::ForCurrentProcess()->HasSwitch(
-      installer::switches::kSystemLevelToast);
-
-  CommandLine cmd(InstallUtil::GetChromeUninstallCmd(system_level_toast,
-                                                     GetType()));
-  base::LaunchProcess(cmd, base::LaunchOptions(), NULL);
-}
-
 bool GoogleChromeDistribution::ShouldSetExperimentLabels() {
   return true;
 }
+
+bool GoogleChromeDistribution::HasUserExperiments() {
+  return true;
+}