Introduce PrefRegistrySyncable, simplifying PrefServiceSyncable.

chrome/browser/profiles/gaia_info_update_service_factory.h

 // 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.
 
 #ifndef CHROME_BROWSER_PROFILES_GAIA_INFO_UPDATE_SERVICE_FACTORY_H_
 #define CHROME_BROWSER_PROFILES_GAIA_INFO_UPDATE_SERVICE_FACTORY_H_
 
 #include "base/memory/singleton.h"
 #include "chrome/browser/profiles/profile_keyed_service_factory.h"
 
 class GAIAInfoUpdateService;
-class PrefServiceSyncable;
+class PrefRegistrySyncable;
 class Profile;
 
 // Singleton that owns all GAIAInfoUpdateServices and associates them with
 // Profiles. Listens for the Profile's destruction notification and cleans up
 // the associated GAIAInfoUpdateService.
 class GAIAInfoUpdateServiceFactory : public ProfileKeyedServiceFactory {
  public:
   // Returns the instance of GAIAInfoUpdateService associated with this profile
   // (creating one if none exists). Returns NULL if this profile cannot have a
   // GAIAInfoUpdateService (for example, if |profile| is incognito).
   static GAIAInfoUpdateService* GetForProfile(Profile* profile);
 
   // Returns an instance of the GAIAInfoUpdateServiceFactory singleton.
   static GAIAInfoUpdateServiceFactory* GetInstance();
 
  private:
   friend struct DefaultSingletonTraits<GAIAInfoUpdateServiceFactory>;
 
   GAIAInfoUpdateServiceFactory();
   virtual ~GAIAInfoUpdateServiceFactory();
 
   // ProfileKeyedServiceFactory:
   virtual ProfileKeyedService* BuildServiceInstanceFor(
       Profile* profile) const OVERRIDE;
 
-  virtual void RegisterUserPrefs(PrefServiceSyncable* user_prefs) OVERRIDE;
+  virtual void RegisterUserPrefs(PrefRegistrySyncable* registry) OVERRIDE;
   virtual bool ServiceIsNULLWhileTesting() const OVERRIDE;
 
   DISALLOW_COPY_AND_ASSIGN(GAIAInfoUpdateServiceFactory);
 };
 
 #endif  // CHROME_BROWSER_PROFILES_GAIA_INFO_UPDATE_SERVICE_FACTORY_H_