Fix MenuModelAdapter clang build

views/controls/menu/menu_model_adapter.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 VIEWS_CONTROLS_MENU_MENU_MODEL_ADAPTER_H_
 #define VIEWS_CONTROLS_MENU_MENU_MODEL_ADAPTER_H_
 #pragma once
 
 #include <map>
 
 #include "views/controls/menu/menu_delegate.h"
 
 namespace ui {
 class MenuModel;
 }
 
 namespace views {
 class MenuItemView;
 
 // This class wraps an instance of ui::MenuModel with the
 // views::MenuDelegate interface required by views::MenuItemView.
 class MenuModelAdapter : public MenuDelegate {
  public:
   // The caller retains ownership of the ui::MenuModel instance and
   // must ensure it exists for the lifetime of the adapter.  The
   // base_id argument is the command id for the first menu item.
   explicit MenuModelAdapter(ui::MenuModel* menu_model);
+  virtual ~MenuModelAdapter();
 
   // Populate a MenuItemView menu with the ui::MenuModel items
   // (including submenus).
   virtual void BuildMenu(MenuItemView* menu);
 
  protected:
   // views::MenuDelegate implementation.
   virtual void ExecuteCommand(int id) OVERRIDE;
   virtual void ExecuteCommand(int id, int mouse_event_flags) OVERRIDE;
   virtual bool GetAccelerator(int id,
@@ skipping 18 matching lines @@
 
   // Map MenuItems to MenuModels.  Used to implement WillShowMenu().
   std::map<MenuItemView*, ui::MenuModel*> menu_map_;
 
   DISALLOW_COPY_AND_ASSIGN(MenuModelAdapter);
 };
 
 }  // namespace views
 
 #endif  // VIEWS_CONTROLS_MENU_MENU_MODEL_ADAPTER_H_