Split PrefService into PrefService, PrefServiceSimple and PrefServiceSyncable.

chrome/browser/geolocation/geolocation_prefs.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/geolocation/geolocation_prefs.h"
 
 #include "chrome/browser/geolocation/chrome_access_token_store.h"
 #include "chrome/browser/geolocation/chrome_geolocation_permission_context_factory.h"
 
 namespace geolocation {
-void RegisterPrefs(PrefService* prefs) {
+void RegisterPrefs(PrefServiceSimple* prefs) {
   // Fan out to all geolocation sub-components that use prefs.
   ChromeAccessTokenStore::RegisterPrefs(prefs);
 }
 
-void RegisterUserPrefs(PrefService* user_prefs) {
+void RegisterUserPrefs(PrefServiceSyncable* user_prefs) {
   ChromeGeolocationPermissionContextFactory::RegisterUserPrefs(user_prefs);
 }
 
 }  // namespace geolocation