Introduce PrefRegistrySyncable, simplifying PrefServiceSyncable.

chrome/browser/themes/theme_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_THEMES_THEME_SERVICE_FACTORY_H_
 #define CHROME_BROWSER_THEMES_THEME_SERVICE_FACTORY_H_
 
 #include "base/basictypes.h"
 #include "base/memory/singleton.h"
 #include "chrome/browser/profiles/profile_keyed_service_factory.h"
 
+class PrefRegistrySyncable;
 class Profile;
 class ThemeService;
 
 namespace extensions {
 class Extension;
 }
 
 // Singleton that owns all ThemeServices and associates them with
 // Profiles. Listens for the Profile's destruction notification and cleans up
 // the associated ThemeService.
@@ skipping 13 matching lines @@
 
  private:
   friend struct DefaultSingletonTraits<ThemeServiceFactory>;
 
   ThemeServiceFactory();
   virtual ~ThemeServiceFactory();
 
   // ProfileKeyedServiceFactory:
   virtual ProfileKeyedService* BuildServiceInstanceFor(
       Profile* profile) const OVERRIDE;
-  virtual void RegisterUserPrefs(PrefServiceSyncable* prefs) OVERRIDE;
+  virtual void RegisterUserPrefs(PrefRegistrySyncable* registry) OVERRIDE;
   virtual bool ServiceRedirectedInIncognito() const OVERRIDE;
 
   DISALLOW_COPY_AND_ASSIGN(ThemeServiceFactory);
 };
 
 #endif  // CHROME_BROWSER_THEMES_THEME_SERVICE_FACTORY_H_