Change MenuControllerDelegate to provide WeakPtr

ui/views/controls/menu/menu_controller_delegate.h

 // Copyright (c) 2011 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 UI_VIEWS_CONTROLS_MENU_MENU_CONTROLLER_DELEGATE_H_
 #define UI_VIEWS_CONTROLS_MENU_MENU_CONTROLLER_DELEGATE_H_
 
+#include "base/memory/weak_ptr.h"
+
 namespace views {
 
 class MenuItemView;
 
 // This is internal as there should be no need for usage of this class outside
 // of views.
 namespace internal {
 
 // Used by MenuController to notify of interesting events that are intended for
 // the class using MenuController. This is implemented by MenuRunnerImpl.
-class MenuControllerDelegate {
+class MenuControllerDelegate
+    : public base::SupportsWeakPtr<MenuControllerDelegate> {
  public:
   enum NotifyType {
     NOTIFY_DELEGATE,
     DONT_NOTIFY_DELEGATE
   };
 
   // Invoked when MenuController closes a menu and the MenuController was
   // configured for asynchronous or drop (MenuRunner::ASYNC,
   // MenuRunner::FOR_DROP). |mouse_event_flags| are the flags set on the
   // ui::MouseEvent which selected |menu|, otherwise 0.
   virtual void OnMenuClosed(NotifyType type,
                             MenuItemView* menu,
                             int mouse_event_flags) = 0;
 
   // Invoked when the MenuDelegate::GetSiblingMenu() returns non-NULL.
   virtual void SiblingMenuCreated(MenuItemView* menu) = 0;
 
  protected:
   virtual ~MenuControllerDelegate() {}
 };
 
 }  // namespace internal
 
 }  // namespace view
 
 #endif  // UI_VIEWS_CONTROLS_MENU_MENU_CONTROLLER_DELEGATE_H_