Delete both regular and Metro user data dirs on uninstall.

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 <vector>
@@ skipping 746 matching lines @@
     // 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
-    // chrome user data directory.
-    FilePath user_data_dir(product.GetUserDataPath());
+    // most recently-used chrome user data directory.
+    std::vector<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;
 
-    int dir_age_hours = GetDirectoryWriteAgeInHours(
-        user_data_dir.value().c_str());
     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) {
@@ skipping 87 matching lines @@
   // 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);
 }
 #endif