Ash: Fix browser icon menu model lifetime

chrome/browser/ui/ash/launcher/chrome_launcher_app_menu_item_browser.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_ASH_LAUNCHER_CHROME_LAUNCHER_APP_MENU_ITEM_BROWSER_H_
 #define CHROME_BROWSER_UI_ASH_LAUNCHER_CHROME_LAUNCHER_APP_MENU_ITEM_BROWSER_H_
 
 #include "base/values.h"
 #include "chrome/browser/ui/ash/launcher/chrome_launcher_app_menu_item.h"
 #include "content/public/browser/notification_observer.h"
 #include "content/public/browser/notification_registrar.h"
 
 class Browser;
 
 // A menu item controller for a running browser. It gets created when an
 // application list gets created. It's main purpose is to add the activation
 // method to the |ChromeLauncherAppMenuItem| class.
 class ChromeLauncherAppMenuItemBrowser : public content::NotificationObserver,
                                          public ChromeLauncherAppMenuItem {
  public:
   ChromeLauncherAppMenuItemBrowser(const base::string16 title,
                                    const gfx::Image* icon,
                                    Browser* browser,
                                    bool has_leading_separator);
+  virtual ~ChromeLauncherAppMenuItemBrowser();
+
   virtual bool IsActive() const OVERRIDE;
   virtual bool IsEnabled() const OVERRIDE;
   virtual void Execute(int event_flags) OVERRIDE;
 
  private:
   // content::NotificationObserver.
   virtual void Observe(int type,
                        const content::NotificationSource& source,
                        const content::NotificationDetails& details) OVERRIDE;
 
   // The browser which is associated which this item.
   Browser* browser_;
 
   content::NotificationRegistrar registrar_;
 
   DISALLOW_COPY_AND_ASSIGN(ChromeLauncherAppMenuItemBrowser);
 };
 
 #endif  // CHROME_BROWSER_UI_ASH_LAUNCHER_CHROME_LAUNCHER_APP_MENU_ITEM_BROWSER_H_