Fix clang error

chrome/browser/ui/views/avatar_menu.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 CHROME_BROWSER_UI_VIEWS_AVATAR_MENU_H_
 #define CHROME_BROWSER_UI_VIEWS_AVATAR_MENU_H_
 #pragma once
 
 #include <map>
 #include <utility>
 
 #include "base/memory/ref_counted.h"
 #include "base/memory/scoped_ptr.h"
 #include "ui/base/models/menu_model.h"
 #include "views/controls/menu/menu_model_adapter.h"
 
 class Profile;
 
 class AvatarMenu : public base::RefCounted<AvatarMenu>,
                    public views::MenuModelAdapter {
  public:
   AvatarMenu(ui::MenuModel* model, Profile* profile);
-  ~AvatarMenu();
+  virtual ~AvatarMenu();
 
   // Shows the menu relative to the specified view.
   void RunMenu(views::MenuButton* host);
 
  private:
   // The views menu.
   scoped_ptr<views::MenuItemView> root_;
 
   // Profile the menu is being shown for.
   Profile* profile_;
 
   DISALLOW_COPY_AND_ASSIGN(AvatarMenu);
 };
 
 #endif  // CHROME_BROWSER_UI_VIEWS_AVATAR_MENU_H_