Revert r21117 as it caused reliability failures....

chrome/utility/utility_thread.h

Index: chrome/utility/utility_thread.h
===================================================================
--- chrome/utility/utility_thread.h	(revision 21215)
+++ chrome/utility/utility_thread.h	(working copy)
@@ -7,6 +7,7 @@
 
 #include <string>
 
+#include "base/thread.h"
 #include "chrome/common/child_thread.h"
 
 class GURL;
@@ -30,6 +31,10 @@
   // 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);
 };