Simplify threading in browser thread by making only ChromeThread deal with di...

chrome/browser/renderer_host/resource_dispatcher_host.cc

Index: chrome/browser/renderer_host/resource_dispatcher_host.cc
===================================================================
--- chrome/browser/renderer_host/resource_dispatcher_host.cc	(revision 30037)
+++ chrome/browser/renderer_host/resource_dispatcher_host.cc	(working copy)
@@ -322,9 +322,6 @@
   // runs if the timer is still running the Task is deleted twice (once by
   // the MessageLoop and the second time by RepeatingTimer).
   update_load_states_timer_.Stop();
-  // Let the WebKit thread know the IO thread is going away soon and that it
-  // should prepare for its own shutdown soon after.
-  webkit_thread_->Shutdown();
 }
 
 bool ResourceDispatcherHost::HandleExternalProtocol(int request_id,