Revert 111695 - Have content/ create and destroy its own threads.

content/browser/browser_process_sub_thread.cc

Index: content/browser/browser_process_sub_thread.cc
===================================================================
--- content/browser/browser_process_sub_thread.cc	(revision 111697)
+++ content/browser/browser_process_sub_thread.cc	(working copy)
@@ -17,6 +17,8 @@
     : BrowserThreadImpl(identifier) {}
 
 BrowserProcessSubThread::~BrowserProcessSubThread() {
+  // We cannot rely on our base class to stop the thread since we want our
+  // CleanUp function to run.
   Stop();
 }
 
@@ -27,13 +29,9 @@
 #endif
 
   notification_service_ = new NotificationServiceImpl;
-
-  BrowserThreadImpl::Init();
 }
 
 void BrowserProcessSubThread::CleanUp() {
-  BrowserThreadImpl::CleanUp();
-
   delete notification_service_;
   notification_service_ = NULL;