Introduce PrefRegistrySyncable, simplifying PrefServiceSyncable.

chrome/browser/background/background_contents_service_factory.cc

 // 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.
 
 #include "chrome/browser/background/background_contents_service_factory.h"
 
 #include "base/command_line.h"
 #include "chrome/browser/background/background_contents_service.h"
+#include "chrome/browser/prefs/pref_registry_syncable.h"
 #include "chrome/browser/prefs/pref_service.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/browser/profiles/profile_dependency_manager.h"
 #include "chrome/common/pref_names.h"
 
 // static
 BackgroundContentsService* BackgroundContentsServiceFactory::GetForProfile(
     Profile* profile) {
   return static_cast<BackgroundContentsService*>(
       GetInstance()->GetServiceForProfile(profile, true));
@@ skipping 13 matching lines @@
 BackgroundContentsServiceFactory::~BackgroundContentsServiceFactory() {
 }
 
 ProfileKeyedService* BackgroundContentsServiceFactory::BuildServiceInstanceFor(
     Profile* profile) const {
   return new BackgroundContentsService(profile,
                                        CommandLine::ForCurrentProcess());
 }
 
 void BackgroundContentsServiceFactory::RegisterUserPrefs(
-    PrefServiceSyncable* user_prefs) {
+    PrefRegistrySyncable* user_prefs) {
   user_prefs->RegisterDictionaryPref(prefs::kRegisteredBackgroundContents,
-                                     PrefServiceSyncable::UNSYNCABLE_PREF);
+                                     PrefRegistrySyncable::UNSYNCABLE_PREF);
 }
 
 bool
 BackgroundContentsServiceFactory::ServiceHasOwnInstanceInIncognito() const {
   return true;
 }
 
 bool BackgroundContentsServiceFactory::ServiceIsCreatedWithProfile() const {
   return true;
 }
 
 bool BackgroundContentsServiceFactory::ServiceIsNULLWhileTesting() const {
   return true;
 }