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

webkit/tools/test_shell/test_web_worker.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_TOOLS_TEST_SHELL_TEST_WEB_WORKER_H_
 #define WEBKIT_TOOLS_TEST_SHELL_TEST_WEB_WORKER_H_
 
 #if ENABLE(WORKERS)
 
 #include "base/basictypes.h"
@@ skipping 24 matching lines @@
   }
   virtual void terminateWorkerContext() {
   }
   virtual void postMessageToWorkerContext(
       const WebKit::WebString& message,
       const WebKit::WebMessagePortChannelArray& channel) {
   }
   virtual void workerObjectDestroyed() {
     Release();  // Releases the reference held for worker object.
   }
+  virtual void clientDestroyed() {
+  }
 
   // WebWorkerClient methods:
   virtual void postMessageToWorkerObject(
       const WebKit::WebString& message,
       const WebKit::WebMessagePortChannelArray& channel) {
   }
   virtual void postExceptionToWorkerObject(
       const WebKit::WebString& error_message,
       int line_number,
       const WebKit::WebString& source_url) {
@@ skipping 19 matching lines @@
     return NULL;
   }
 
  private:
   DISALLOW_COPY_AND_ASSIGN(TestWebWorker);
 };
 
 #endif
 
 #endif  // WEBKIT_TOOLS_TEST_SHELL_TEST_WEB_WORKER_H_