Add undeclared virtual destructors part 2...

views/controls/menu/view_menu_delegate.h

 // Copyright (c) 2006-2009 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_VIEW_MENU_DELEGATE_H_
 #define VIEWS_CONTROLS_MENU_VIEW_MENU_DELEGATE_H_
 
 #include "gfx/native_widget_types.h"
 
 namespace gfx {
@@ skipping 11 matching lines @@
 // An interface that allows a component to tell a View about a menu that it
 // has constructed that the view can show (e.g. for MenuButton views, or as a
 // context menu.)
 //
 ////////////////////////////////////////////////////////////////////////////////
 class ViewMenuDelegate {
  public:
   // Create and show a menu at the specified position. Source is the view the
   // ViewMenuDelegate was set on.
   virtual void RunMenu(View* source, const gfx::Point& pt) = 0;
+
+ protected:
+  virtual ~ViewMenuDelegate() {}
 };
 
 }  // namespace views
 
 #endif  // VIEWS_CONTROLS_MENU_VIEW_MENU_DELEGATE_H_