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

chrome/browser/profiles/profile_impl.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.
 
 // This class gathers state related to a single user profile.
 
 #ifndef CHROME_BROWSER_PROFILES_PROFILE_IMPL_H_
 #define CHROME_BROWSER_PROFILES_PROFILE_IMPL_H_
 #pragma once
 
@@ skipping 119 matching lines @@
   virtual ExtensionInfoMap* GetExtensionInfoMap();
   virtual PromoCounter* GetInstantPromoCounter();
   virtual BrowserSignin* GetBrowserSignin();
   virtual policy::ProfilePolicyContext* GetPolicyContext();
   virtual ChromeURLDataManager* GetChromeURLDataManager();
 
 #if defined(OS_CHROMEOS)
   virtual void ChangeAppLocale(const std::string& locale, AppLocaleChangedVia);
   virtual chromeos::ProxyConfigServiceImpl* GetChromeOSProxyConfigServiceImpl();
   virtual void SetupChromeOSEnterpriseExtensionObserver();
+  virtual void InitChromeOSPreferences();
 #endif  // defined(OS_CHROMEOS)
 
   virtual PrefProxyConfigTracker* GetProxyConfigTracker();
   virtual PrerenderManager* GetPrerenderManager();
 
   // NotificationObserver implementation.
   virtual void Observe(NotificationType type,
                        const NotificationSource& source,
                        const NotificationDetails& details);
 
@@ skipping 156 matching lines @@
   scoped_refptr<PrefProxyConfigTracker> pref_proxy_config_tracker_;
 
   scoped_refptr<PrerenderManager> prerender_manager_;
 
   scoped_ptr<ChromeURLDataManager> chrome_url_data_manager_;
 
   DISALLOW_COPY_AND_ASSIGN(ProfileImpl);
 };
 
 #endif  // CHROME_BROWSER_PROFILES_PROFILE_IMPL_H_