Factor out logic to find chrome.exe from Omaha client state.

cloud_print/service/win/chrome_launcher.cc

Index: cloud_print/service/win/chrome_launcher.cc
diff --git a/cloud_print/service/win/chrome_launcher.cc b/cloud_print/service/win/chrome_launcher.cc
index 5921fd0e84f1d35729ecedc5d9a53aa637ff4cce..5df9bae5d6ddda659d0380c60733d2b053e3c693 100644
--- a/cloud_print/service/win/chrome_launcher.cc
+++ b/cloud_print/service/win/chrome_launcher.cc
@@ -5,28 +5,15 @@
 #include "cloud_print/service/win/chrome_launcher.h"
 
 #include "base/command_line.h"
-#include "base/file_util.h"
-#include "base/path_service.h"
 #include "base/process.h"
 #include "base/process_util.h"
-#include "base/win/registry.h"
 #include "base/win/scoped_handle.h"
 #include "base/win/scoped_process_information.h"
+#include "chrome/installer/launcher_support/chrome_launcher_support.h"
 #include "cloud_print/service/service_switches.h"
 
 namespace {
 
-const wchar_t kChromeRegClientStateKey[] =
-    L"Software\\Google\\Update\\ClientState\\"
-    L"{8A69D345-D564-463c-AFF1-A69D9E530F96}";
-
-const wchar_t kGoogleChromeExePath[] =
-    L"Google\\Chrome\\Application\\chrome.exe";
-
-const wchar_t kUninstallStringField[] = L"UninstallString";
-
-const wchar_t kChromeExe[] = L"chrome.exe";
-
 const int kShutdownTimeoutMs = 30 * 1000;
 
 void ShutdownChrome(HANDLE process, DWORD thread_id) {
@@ -62,21 +49,6 @@ bool LaunchProcess(const CommandLine& cmdline,
   return true;
 }
 
-FilePath GetAnyChromePath() {
-  FilePath chrome_path = ChromeLauncher::GetChromePath(HKEY_LOCAL_MACHINE);
-  if (!chrome_path.empty())
-    return chrome_path;
-  chrome_path = ChromeLauncher::GetChromePath(HKEY_CURRENT_USER);
-  if (!chrome_path.empty())
-    return chrome_path;
-  if (PathService::Get(base::DIR_PROGRAM_FILES, &chrome_path)) {
-    chrome_path.Append(kGoogleChromeExePath);
-    if (file_util::PathExists(chrome_path))
-      return chrome_path;
-  }
-  return FilePath();
-}
-
 }  // namespace
 
 ChromeLauncher::ChromeLauncher(const FilePath& user_data)
@@ -106,7 +78,7 @@ void ChromeLauncher::Run() {
 
   for (base::TimeDelta time_out = default_time_out;;
        time_out = std::min(time_out * 2, max_time_out)) {
-    FilePath chrome_path = GetAnyChromePath();
+    FilePath chrome_path = chrome_launcher_support::GetAnyChromePath();
 
     if (!chrome_path.empty()) {
       CommandLine cmd(chrome_path);
@@ -138,35 +110,4 @@ void ChromeLauncher::Run() {
   }
 }
 
-FilePath ChromeLauncher::GetChromePath(HKEY key) {
-  using base::win::RegKey;
-  RegKey reg_key(key, kChromeRegClientStateKey, KEY_QUERY_VALUE);
-
-  FilePath chrome_exe_path;
-
-  if (reg_key.Valid()) {
-    // Now grab the uninstall string from the appropriate ClientState key
-    // and use that as the base for a path to chrome.exe.
-    string16 uninstall;
-    if (reg_key.ReadValue(kUninstallStringField, &uninstall) == ERROR_SUCCESS) {
-      // The uninstall path contains the path to setup.exe which is two levels
-      // down from chrome.exe. Move up two levels (plus one to drop the file
-      // name) and look for chrome.exe from there.
-      FilePath uninstall_path(uninstall);
-      chrome_exe_path =
-          uninstall_path.DirName().DirName().DirName().Append(kChromeExe);
-      if (!file_util::PathExists(chrome_exe_path)) {
-        // By way of mild future proofing, look up one to see if there's a
-        // chrome.exe in the version directory
-        chrome_exe_path =
-            uninstall_path.DirName().DirName().Append(kChromeExe);
-      }
-    }
-  }
-
-  if (file_util::PathExists(chrome_exe_path))
-    return chrome_exe_path;
-
-  return FilePath();
-}