Fix another race condition on worker process shutdown that results in use-aft...

chrome/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 CHROME_RENDERER_WEBWORKER_PROXY_H_
 #define CHROME_RENDERER_WEBWORKER_PROXY_H_
 
 #include <vector>
 
 #include "base/basictypes.h"
@@ skipping 20 matching lines @@
 
   // 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();
+  virtual void clientDestroyed();
 
   // IPC::Channel::Listener implementation.
   void OnMessageReceived(const IPC::Message& message);
 
  private:
   bool Send(IPC::Message* message);
 
   void OnDedicatedWorkerCreated();
   void OnPostMessage(const string16& message,
                      const std::vector<int>& sent_message_port_ids,
@@ skipping 15 matching lines @@
   // messages.
   WebKit::WebWorkerClient* client_;
 
   // Stores messages that were sent before the StartWorkerContext message.
   std::vector<IPC::Message*> queued_messages_;
 
   DISALLOW_COPY_AND_ASSIGN(WebWorkerProxy);
 };
 
 #endif  // CHROME_RENDERER_WEBWORKER_PROXY_H_