Fix Ash notification updates

chrome/browser/ui/views/ash/balloon_view_ash.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_UI_VIEWS_ASH_BALLOON_VIEW_ASH_H_
 #define CHROME_BROWSER_UI_VIEWS_ASH_BALLOON_VIEW_ASH_H_
 
 #include "chrome/browser/notifications/balloon.h"
 
 // On Ash, a "BalloonView" is just a wrapper for ash notification entries.
@@ skipping 12 matching lines @@
 
  private:
   class IconFetcher;
 
   void FetchIcon(const Notification& notification);
   std::string GetExtensionId(Balloon* balloon);
 
   BalloonCollection* collection_;
   Balloon* balloon_;
   scoped_ptr<IconFetcher> icon_fetcher_;
+  // Track the current notification id so that it can be updated properly.
+  std::string current_notification_id_;
 
   DISALLOW_COPY_AND_ASSIGN(BalloonViewAsh);
 };
 
 #endif  // CHROME_BROWSER_UI_VIEWS_ASH_BALLOON_VIEW_ASH_H_