Split PrefService into PrefService, PrefServiceSimple and PrefServiceSyncable.

chrome/browser/web_resource/plugins_resource_service.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/web_resource/plugins_resource_service.h"
 
 #include "base/command_line.h"
 #include "chrome/browser/plugins/plugin_finder.h"
 #include "chrome/browser/prefs/pref_service.h"
 #include "chrome/common/chrome_switches.h"
@@ skipping 47 matching lines @@
                          false,
                          prefs::kPluginsResourceCacheUpdate,
                          kStartResourceFetchDelayMs,
                          GetCacheUpdateDelay()) {
 }
 
 PluginsResourceService::~PluginsResourceService() {
 }
 
 // static
-void PluginsResourceService::RegisterPrefs(PrefService* local_state) {
+void PluginsResourceService::RegisterPrefs(PrefServiceSimple* local_state) {
   local_state->RegisterDictionaryPref(
       prefs::kPluginsMetadata, new base::DictionaryValue());
   local_state->RegisterStringPref(prefs::kPluginsResourceCacheUpdate, "0");
 }
 
 void PluginsResourceService::Unpack(const DictionaryValue& parsed_json) {
   prefs_->Set(prefs::kPluginsMetadata, parsed_json);
   PluginFinder::GetInstance()->ReinitializePlugins(parsed_json);
 }