Remove the OnError method from notification delegates.

content/renderer/notification_provider.h

 // 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.
 
 #ifndef CONTENT_RENDERER_NOTIFICATION_PROVIDER_H_
 #define CONTENT_RENDERER_NOTIFICATION_PROVIDER_H_
 
 #include "base/memory/scoped_vector.h"
 #include "content/public/renderer/render_frame_observer.h"
 #include "content/renderer/active_notification_tracker.h"
@@ skipping 28 matching lines @@
   // Sends an IPC to the browser process to display the notification identified
   // by |notification|, accompanied by the downloaded icon.
   void DisplayNotification(int notification_id, const SkBitmap& icon);
 
   // Removes the IconDownload object associated with |notification_id|, stopping
   // any in-progress download. Returns whether the notification was removed.
   bool RemovePendingNotification(int notification_id);
 
   // IPC handlers.
   void OnDisplay(int id);
-  void OnError(int id);
   void OnClose(int id, bool by_user);
   void OnClick(int id);
   void OnNavigate();
 
   // A vector tracking notifications whose icon is still being downloaded.
   typedef ScopedVector<NotificationIconLoader> PendingNotifications;
   PendingNotifications pending_notifications_;
 
   // A tracker object which manages the active notifications and the IDs
   // that are used to refer to them over IPC.
   ActiveNotificationTracker manager_;
 
   DISALLOW_COPY_AND_ASSIGN(NotificationProvider);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_RENDERER_NOTIFICATION_PROVIDER_H_