Introduce PrefRegistrySyncable, simplifying PrefServiceSyncable.

chrome/browser/geolocation/chrome_geolocation_permission_context_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_GEOLOCATION_CHROME_GEOLOCATION_PERMISSION_CONTEXT_FACTORY_H_
 #define CHROME_BROWSER_GEOLOCATION_CHROME_GEOLOCATION_PERMISSION_CONTEXT_FACTORY_H_
 
 #include "base/memory/singleton.h"
 #include "base/values.h"
 #include "chrome/browser/prefs/pref_service.h"
 #include "chrome/browser/profiles/profile_keyed_service_factory.h"
 
 class ChromeGeolocationPermissionContext;
+class PrefRegistrySyncable;
 class Profile;
 
 class ChromeGeolocationPermissionContextFactory
     : public ProfileKeyedServiceFactory {
  public:
   static ChromeGeolocationPermissionContext* GetForProfile(Profile* profile);
 
   static ChromeGeolocationPermissionContextFactory* GetInstance();
 
  private:
   friend struct
       DefaultSingletonTraits<ChromeGeolocationPermissionContextFactory>;
 
   ChromeGeolocationPermissionContextFactory();
   virtual ~ChromeGeolocationPermissionContextFactory();
 
   // |ProfileKeyedBaseFactory| methods:
   virtual ProfileKeyedService*
       BuildServiceInstanceFor(Profile* profile) const OVERRIDE;
-  virtual void RegisterUserPrefs(PrefServiceSyncable* user_prefs) OVERRIDE;
+  virtual void RegisterUserPrefs(PrefRegistrySyncable* registry) OVERRIDE;
   virtual bool ServiceRedirectedInIncognito() const OVERRIDE;
 
   DISALLOW_COPY_AND_ASSIGN(ChromeGeolocationPermissionContextFactory);
 };
 
 #endif  // CHROME_BROWSER_GEOLOCATION_CHROME_GEOLOCATION_PERMISSION_CONTEXT_FACTORY_H_