Revert r21117 as it caused reliability failures....

chrome/utility/utility_thread.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_UTILITY_UTILITY_THREAD_H_
 #define CHROME_UTILITY_UTILITY_THREAD_H_
 
 #include <string>
 
+#include "base/thread.h"
 #include "chrome/common/child_thread.h"
 
 class GURL;
 
 // This class represents the background thread where the utility task runs.
 class UtilityThread : public ChildThread {
  public:
   UtilityThread();
   ~UtilityThread();
 
   // Returns the one utility thread.
   static UtilityThread* current() {
     return static_cast<UtilityThread*>(ChildThread::current());
   }
 
  private:
   // IPC messages
   virtual void OnControlMessageReceived(const IPC::Message& msg);
   void OnUnpackExtension(const FilePath& extension_path);
 
   // IPC messages for web resource service.
   void OnUnpackWebResource(const std::string& resource_data);
 
+  // Called by the thread base class
+  virtual void Init();
+  virtual void CleanUp();
+
   DISALLOW_COPY_AND_ASSIGN(UtilityThread);
 };
 
 #endif  // CHROME_UTILITY_UTILITY_THREAD_H_