Adds async interface method to PersistentPrefStore.

chrome/browser/prefs/pref_notifier.h

-// Copyright (c) 2010 The Chromium Authors. All rights reserved.
+// 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.
 
 #ifndef CHROME_BROWSER_PREFS_PREF_NOTIFIER_H_
 #define CHROME_BROWSER_PREFS_PREF_NOTIFIER_H_
 #pragma once
 
 #include <string>
 
 // Delegate interface used by PrefValueStore to notify its owner about changes
 // to the preference values.
 // TODO(mnissler, danno): Move this declaration to pref_value_store.h once we've
 // cleaned up all public uses of this interface.
 class PrefNotifier {
  public:
   virtual ~PrefNotifier() {}
 
   // Sends out a change notification for the preference identified by
   // |pref_name|.
   virtual void OnPreferenceChanged(const std::string& pref_name) = 0;
 
   // Broadcasts the intialization completed notification.
-  virtual void OnInitializationCompleted() = 0;
+  virtual void OnInitializationCompleted(bool succeeded) = 0;
 };
 
 #endif  // CHROME_BROWSER_PREFS_PREF_NOTIFIER_H_