Remove unnecessary image downloading handler of notifications.

chrome/browser/notifications/notification.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/notifications/notification.h"
 
 Notification::Notification(
     message_center::NotificationType type,
     const GURL& origin_url,
     const base::string16& title,
@@ skipping 14 matching lines @@
                                    notifier_id,
                                    rich_notification_data,
                                    delegate),
       origin_url_(origin_url),
       replace_id_(replace_id),
       delegate_(delegate) {}
 
 Notification::Notification(const Notification& notification)
     : message_center::Notification(notification),
       origin_url_(notification.origin_url()),
-      button_one_icon_url_(notification.button_one_icon_url()),
-      button_two_icon_url_(notification.button_two_icon_url()),
-      image_url_(notification.image_url()),
       replace_id_(notification.replace_id()),
       delegate_(notification.delegate()) {}
 
 Notification::~Notification() {}
 
 Notification& Notification::operator=(const Notification& notification) {
   message_center::Notification::operator=(notification);
   origin_url_ = notification.origin_url();
-  button_one_icon_url_ = notification.button_one_icon_url();
-  button_two_icon_url_ = notification.button_two_icon_url();
-  image_url_ = notification.image_url();
   replace_id_ = notification.replace_id();
   delegate_ = notification.delegate();
   return *this;
 }