Virtual destructors should have virtual keyword.

content/renderer/webplugin_delegate_proxy.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 CONTENT_RENDERER_WEBPLUGIN_DELEGATE_PROXY_H_
 #define CONTENT_RENDERER_WEBPLUGIN_DELEGATE_PROXY_H_
 #pragma once
 
 #include <string>
 #include <vector>
@@ skipping 105 matching lines @@
   virtual void InstallMissingPlugin();
   virtual webkit::npapi::WebPluginResourceClient* CreateResourceClient(
       unsigned long resource_id, const GURL& url, int notify_id);
   virtual webkit::npapi::WebPluginResourceClient* CreateSeekableResourceClient(
       unsigned long resource_id, int range_request_id);
 
   gfx::PluginWindowHandle GetPluginWindowHandle();
 
  protected:
   template<class WebPluginDelegateProxy> friend class DeleteTask;
-  ~WebPluginDelegateProxy();
+  virtual ~WebPluginDelegateProxy();
 
  private:
   // Message handlers for messages that proxy WebPlugin methods, which
   // we translate into calls to the real WebPlugin.
   void OnSetWindow(gfx::PluginWindowHandle window);
 #if defined(OS_WIN)
   void OnSetWindowlessPumpEvent(HANDLE modal_loop_pump_messages_event);
 #endif
   void OnCompleteURL(const std::string& url_in, std::string* url_out,
                      bool* result);
@@ skipping 128 matching lines @@
   // This lets us know which portion of the backing store has been painted into.
   gfx::Rect backing_store_painted_;
 
   // The url of the main frame hosting the plugin.
   GURL page_url_;
 
   DISALLOW_COPY_AND_ASSIGN(WebPluginDelegateProxy);
 };
 
 #endif  // CONTENT_RENDERER_WEBPLUGIN_DELEGATE_PROXY_H_