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

webkit/glue/webworker_impl.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 WEBKIT_GLUE_WEBWORKER_IMPL_H_
 #define WEBKIT_GLUE_WEBWORKER_IMPL_H_
 
 #include "webkit/api/public/WebWorker.h"
 
 #if ENABLE(WORKERS)
@@ skipping 50 matching lines @@
 
   // WebWorker methods:
   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);
   virtual void workerObjectDestroyed();
+  virtual void clientDestroyed();
 
   WebKit::WebWorkerClient* client() { return client_; }
 
   // Executes the given task on the main thread.
   static void DispatchTaskToMainThread(
       PassRefPtr<WebCore::ScriptExecutionContext::Task> task);
 
  private:
   virtual ~WebWorkerImpl();
 
@@ skipping 49 matching lines @@
   bool asked_to_terminate_;
 
   WTF::RefPtr<WebCore::WorkerThread> worker_thread_;
 
   DISALLOW_COPY_AND_ASSIGN(WebWorkerImpl);
 };
 
 #endif
 
 #endif  // WEBKIT_GLUE_WEBWORKER_IMPL_H_