Remove the OnError method from notification delegates.

content/child/notifications/notification_manager.h

 // Copyright 2014 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 CONTENT_CHILD_NOTIFICATIONS_NOTIFICATION_MANAGER_H_
 #define CONTENT_CHILD_NOTIFICATIONS_NOTIFICATION_MANAGER_H_
 
 #include <map>
 
 #include "base/memory/ref_counted.h"
@@ skipping 34 matching lines @@
   // Called by the NotificationDispatcher.
   bool OnMessageReceived(const IPC::Message& message);
 
  private:
   NotificationManager(
       ThreadSafeSender* thread_safe_sender,
       NotificationDispatcher* notification_dispatcher);
 
   // IPC message handlers.
   void OnShow(int id);
-  void OnError(int id);
   void OnClose(int id);
   void OnClick(int id);
 
   scoped_refptr<ThreadSafeSender> thread_safe_sender_;
   scoped_refptr<NotificationDispatcher> notification_dispatcher_;
 
   // Map to store the delegate associated with a notification request Id.
   std::map<int, blink::WebNotificationDelegate*> active_notifications_;
 
   DISALLOW_COPY_AND_ASSIGN(NotificationManager);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_CHILD_NOTIFICATIONS_NOTIFICATION_MANAGER_H_