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

chrome/test/testing_profile.h

 // 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.
 
 #ifndef CHROME_TEST_TESTING_PROFILE_H_
 #define CHROME_TEST_TESTING_PROFILE_H_
 #pragma once
 
 #include "base/ref_counted.h"
 #include "base/scoped_ptr.h"
@@ skipping 234 matching lines @@
   virtual StatusTray* GetStatusTray();
   virtual FilePath last_selected_directory();
   virtual void set_last_selected_directory(const FilePath& path);
 #if defined(OS_CHROMEOS)
   virtual chromeos::ProxyConfigServiceImpl*
       GetChromeOSProxyConfigServiceImpl() {
     return NULL;
   }
   virtual void SetupChromeOSEnterpriseExtensionObserver() {
   }
+  virtual void InitChromeOSPreferences() {
+  }
   virtual void ChangeAppLocale(const std::string&, AppLocaleChangedVia) {
   }
 #endif  // defined(OS_CHROMEOS)
 
   virtual PrefProxyConfigTracker* GetProxyConfigTracker();
 
   // Schedules a task on the history backend and runs a nested loop until the
   // task is processed.  This has the effect of blocking the caller until the
   // history service processes all pending requests.
   void BlockUntilHistoryProcessesPendingRequests();
@@ skipping 129 matching lines @@
   explicit DerivedTestingProfile(Profile* profile);
   virtual ~DerivedTestingProfile();
 
   virtual ProfileId GetRuntimeId();
 
  protected:
   Profile* original_profile_;
 };
 
 #endif  // CHROME_TEST_TESTING_PROFILE_H_