Add undeclared virtual destructors part 2...

chrome/renderer/pepper_widget.h

 // Copyright (c) 2010 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_RENDERER_PEPPER_WIDGET_H_
 #define CHROME_RENDERER_PEPPER_WIDGET_H_
 
 #include "base/basictypes.h"
 #include "third_party/npapi/bindings/npapi_extensions.h"
 
 class Graphics2DDeviceContext;
 
 // Every class that implements a Pepper widget derives from this.
 class PepperWidget {
  public:
   static NPWidgetExtensions* GetWidgetExtensions();
 
   PepperWidget();
   void Init(NPP instance, int id);
 
   // Called as a result of the corresponding Pepper functions.
   virtual void Destroy() = 0;
   virtual void Paint(Graphics2DDeviceContext* context, const NPRect& dirty) = 0;
   virtual bool HandleEvent(const NPPepperEvent& event) = 0;
   virtual void GetProperty(NPWidgetProperty property, void* value) = 0;
   virtual void SetProperty(NPWidgetProperty property, void* value) = 0;
 
  protected:
-  ~PepperWidget();
+  virtual ~PepperWidget();
 
   // Tells the plugin that a property changed.
   void WidgetPropertyChanged(NPWidgetProperty property);
 
  private:
   NPP instance_;
   int id_;
 
   DISALLOW_COPY_AND_ASSIGN(PepperWidget);
 };
 
 #endif  // CHROME_RENDERER_PEPPER_WIDGET_H_