Remove unnecessary image downloading handler of notifications.

chrome/browser/notifications/notification_delegate.h

Index: chrome/browser/notifications/notification_delegate.h
diff --git a/chrome/browser/notifications/notification_delegate.h b/chrome/browser/notifications/notification_delegate.h
index a8efacd287730d0db00bf311ade45c024a143218..afd391109c9d399fac13ead99a1dda950e2df114 100644
--- a/chrome/browser/notifications/notification_delegate.h
+++ b/chrome/browser/notifications/notification_delegate.h
@@ -22,12 +22,6 @@ class NotificationDelegate : public message_center::NotificationDelegate {
   // Returns unique id of the notification.
   virtual std::string id() const = 0;
 
-  // Returns the WebContents that generated the notification, or NULL.
-  virtual content::WebContents* GetWebContents() const = 0;
-
-  // Lets the delegate know that no more rendering will be necessary.
-  virtual void ReleaseRenderViewHost();
-
  protected:
   virtual ~NotificationDelegate() {}
 };