Adds async interface method to PersistentPrefStore.

chrome/browser/prefs/pref_service_mock_builder.cc

 // Copyright (c) 2011 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/prefs/pref_service_mock_builder.h"
 
 #include "chrome/browser/policy/configuration_policy_pref_store.h"
 #include "chrome/browser/prefs/command_line_pref_store.h"
 #include "chrome/browser/prefs/default_pref_store.h"
 #include "chrome/browser/prefs/pref_service.h"
@@ skipping 95 matching lines @@
 
 PrefService* PrefServiceMockBuilder::Create() {
   PrefService* pref_service =
       new PrefService(managed_platform_prefs_.get(),
                       managed_cloud_prefs_.get(),
                       extension_prefs_.get(),
                       command_line_prefs_.get(),
                       user_prefs_.get(),
                       recommended_platform_prefs_.get(),
                       recommended_cloud_prefs_.get(),
-                      new DefaultPrefStore(),
-                      NULL);
+                      new DefaultPrefStore());
   managed_platform_prefs_ = NULL;
   managed_cloud_prefs_ = NULL;
   extension_prefs_ = NULL;
   command_line_prefs_ = NULL;
   user_prefs_ = NULL;
   recommended_platform_prefs_ = NULL;
   recommended_cloud_prefs_ = NULL;
   user_prefs_ = new TestingPrefStore;
   return pref_service;
 }