RefCounted types should not have public destructors, webkit/ edition

webkit/plugins/npapi/webplugin_page_delegate.h

 // Copyright (c) 2012 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 WEBKIT_PLUGINS_NPAPI_WEBPLUGIN_PAGE_DELEGATE_H_
 #define WEBKIT_PLUGINS_NPAPI_WEBPLUGIN_PAGE_DELEGATE_H_
 
 #include <string>
 
 #include "ui/gfx/native_widget_types.h"
@@ skipping 42 matching lines @@
       const WebPluginGeometry& move) = 0;
 
   // Notifies the parent view that a load has begun.
   virtual void DidStartLoadingForPlugin() = 0;
 
   // Notifies the parent view that all loads are finished.
   virtual void DidStopLoadingForPlugin() = 0;
 
   // The WebCookieJar to use for this plugin.
   virtual WebKit::WebCookieJar* GetCookieJar() = 0;
+
+ protected:
+  virtual ~WebPluginPageDelegate() {}
 };
 
 }  // namespace npapi
 }  // namespace webkit
 
 #endif  // WEBKIT_PLUGINS_NPAPI_WEBPLUGIN_PAGE_DELEGATE_H_