Add support for Ash to Notifications

chrome/browser/notifications/notification_test_util.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_test_util.h"
 
 MockNotificationDelegate::MockNotificationDelegate(const std::string& id)
     : id_(id) {
 }
 
 MockNotificationDelegate::~MockNotificationDelegate() {}
 
 std::string MockNotificationDelegate::id() const {
   return id_;
 }
 
+content::RenderViewHost* MockNotificationDelegate::GetRenderViewHost() const {
+  return NULL;
+}
+
 void MockBalloonView::Close(bool by_user) {
   balloon_->OnClose(by_user);
 }
 
 gfx::Size MockBalloonView::GetSize() const {
   return balloon_->content_size();
 }
 
 BalloonHost* MockBalloonView::GetHost() const {
   return NULL;
 }