Revert r21117 as it caused reliability failures....

chrome/utility/utility_main.cc

Index: chrome/utility/utility_main.cc
===================================================================
--- chrome/utility/utility_main.cc	(revision 21215)
+++ chrome/utility/utility_main.cc	(working copy)
@@ -20,16 +20,15 @@
 
 // Mainline routine for running as the utility process.
 int UtilityMain(const MainFunctionParams& parameters) {
-  // The main message loop of the utility process.
-  MessageLoop main_message_loop;
+  // The main thread of the render process.
+  MessageLoopForIO main_message_loop;
   std::wstring app_name = chrome::kBrowserAppName;
   PlatformThread::SetName(WideToASCII(app_name + L"_UtilityMain").c_str());
 
   // Initialize the SystemMonitor
   base::SystemMonitor::Start();
 
-  ChildProcess utility_process;
-  utility_process.set_main_thread(new UtilityThread());
+  ChildProcess utility_process(new UtilityThread());
 #if defined(OS_WIN)
   sandbox::TargetServices* target_services =
       parameters.sandbox_info_.TargetServices();