Remove Notification::small_image_url_ as it has no users.

chrome/browser/notifications/notification.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 CHROME_BROWSER_NOTIFICATIONS_NOTIFICATION_H_
 #define CHROME_BROWSER_NOTIFICATIONS_NOTIFICATION_H_
 
 #include <string>
 
 #include "base/basictypes.h"
@@ skipping 56 matching lines @@
   // A url for the button icons to be shown (optional).
   const GURL& button_one_icon_url() const { return button_one_icon_url_; }
   const GURL& button_two_icon_url() const { return button_two_icon_url_; }
 
   // A url for the image to be shown (optional).
   const GURL& image_url() const { return image_url_; }
 
   // Id of the delegate embedded inside this instance.
   std::string delegate_id() const { return delegate()->id(); }
 
-  content::WebContents* GetWebContents() const {
-    return delegate()->GetWebContents();
-  }
-  void DoneRendering() { delegate()->ReleaseRenderViewHost(); }
-
   NotificationDelegate* delegate() const { return delegate_.get(); }
 
  private:
   // The Origin of the page/worker which created this notification.
   GURL origin_url_;
 
   // URL for the icon associated with the notification. Requires delegate_
   // to have a non NULL RenderViewHost.
   GURL icon_url_;
 
   // The URLs of the button images for a rich notification.
   GURL button_one_icon_url_;
   GURL button_two_icon_url_;
 
   // The URL of a large image to be displayed for a a rich notification.
   GURL image_url_;
 
-  // The URL of a small image to be displayed for a a rich notification.
-  GURL small_image_url_;
-
   // The user-supplied replace ID for the notification.
   base::string16 replace_id_;
 
   // A proxy object that allows access back to the JavaScript object that
   // represents the notification, for firing events.
   scoped_refptr<NotificationDelegate> delegate_;
 };
 
 #endif  // CHROME_BROWSER_NOTIFICATIONS_NOTIFICATION_H_