Virtual destructors should have virtual keyword.

content/renderer/webworker_proxy.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 CONTENT_RENDERER_WEBWORKER_PROXY_H_
 #define CONTENT_RENDERER_WEBWORKER_PROXY_H_
 #pragma once
 
 #include <vector>
 
@@ skipping 11 matching lines @@
 // to the glue.  This class converts function calls to IPC messages that are
 // dispatched in the worker process by WebWorkerClientProxy.  It also receives
 // IPC messages from WebWorkerClientProxy which it converts to function calls to
 // WebWorkerClient.
 class WebWorkerProxy : public WebKit::WebWorker, private WebWorkerBase {
  public:
   WebWorkerProxy(WebKit::WebWorkerClient* client,
                  ChildThread* child_thread,
                  int render_view_route_id,
                  int parent_appcache_host_id);
-  ~WebWorkerProxy();
+  virtual ~WebWorkerProxy();
 
   // WebWorker implementation.
   virtual void startWorkerContext(const WebKit::WebURL& script_url,
                                   const WebKit::WebString& user_agent,
                                   const WebKit::WebString& source_code);
   virtual void terminateWorkerContext();
   virtual void postMessageToWorkerContext(
       const WebKit::WebString& message,
       const WebKit::WebMessagePortChannelArray& channel_array);
   virtual void workerObjectDestroyed();
@@ skipping 14 matching lines @@
 
 
   // Used to communicate to the WebCore::Worker object in response to IPC
   // messages.
   WebKit::WebWorkerClient* client_;
 
   DISALLOW_COPY_AND_ASSIGN(WebWorkerProxy);
 };
 
 #endif  // CONTENT_RENDERER_WEBWORKER_PROXY_H_