Fix a bug that caused Chrome OS system preferences not to work in the guest mode.

chrome/browser/ui/browser_init.cc

 // Copyright (c) 2011 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.
 
 #include "chrome/browser/ui/browser_init.h"
 
 #include <algorithm>   // For max().
 
 #include "base/environment.h"
 #include "base/event_recorder.h"
@@ skipping 484 matching lines @@
   in_startup = false;
 
   if (!launched) {
     LOG(ERROR) << "launch error";
     if (return_code)
       *return_code = ResultCodes::INVALID_CMDLINE_URL;
     return false;
   }
 
 #if defined(OS_CHROMEOS)
+  // Initialize Chrome OS preferences like touch pad sensitivity. For the
+  // preferences to work in the guest mode, the initialization has to be
+  // done after |profile| is switched to the off-the-record profile (which
+  // is actually GuestSessionProfile in the guest mode). See the
+  // GetOffTheRecordProfile() call above.
+  profile->InitChromeOSPreferences();
+
   // Create the WmMessageListener so that it can listen for messages regardless
   // of what window has focus.
   chromeos::WmMessageListener::GetInstance();
 
   // Create the SystemKeyEventListener so it can listen for system keyboard
   // messages regardless of focus.
   chromeos::SystemKeyEventListener::GetInstance();
 
   // Create the WmOverviewController so it can register with the listener.
   chromeos::WmOverviewController::GetInstance();
@@ skipping 713 matching lines @@
     return false;
   automation->SetExpectedTabCount(expected_tabs);
 
   AutomationProviderList* list =
       g_browser_process->InitAutomationProviderList();
   DCHECK(list);
   list->AddProvider(automation);
 
   return true;
 }