Add undeclared virtual destructors part 2...

views/controls/combobox/native_combobox_wrapper.h

 // Copyright (c) 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_COMBOBOX_NATIVE_COMBOBOX_WRAPPER_H_
 #define VIEWS_CONTROLS_COMBOBOX_NATIVE_COMBOBOX_WRAPPER_H_
 
 #include "gfx/native_widget_types.h"
 
 namespace gfx{
@@ skipping 28 matching lines @@
   // Retrieves the views::View that hosts the native control.
   virtual View* GetView() = 0;
 
   // Sets the focus to the button.
   virtual void SetFocus() = 0;
 
   // Returns a handle to the underlying native view for testing.
   virtual gfx::NativeView GetTestingHandle() const = 0;
 
   static NativeComboboxWrapper* CreateWrapper(Combobox* combobox);
+
+ protected:
+  virtual ~NativeComboboxWrapper() {}
 };
 
 }  // namespace views
 
 #endif  // VIEWS_CONTROLS_COMBOBOX_NATIVE_COMBOBOX_WRAPPER_H_