Revert 238433 "Merge 233099 "Kill worker process by way of a syn..."

branches/1650/src/content/worker/worker_thread.cc

Index: branches/1650/src/content/worker/worker_thread.cc
===================================================================
--- branches/1650/src/content/worker/worker_thread.cc	(revision 238482)
+++ branches/1650/src/content/worker/worker_thread.cc	(working copy)
@@ -13,7 +13,6 @@
 #include "content/child/indexed_db/indexed_db_message_filter.h"
 #include "content/child/runtime_features.h"
 #include "content/child/web_database_observer_impl.h"
-#include "content/common/child_process_messages.h"
 #include "content/common/worker_messages.h"
 #include "content/public/common/content_switches.h"
 #include "content/worker/websharedworker_stub.h"
@@ -57,13 +56,6 @@
   SetRuntimeFeaturesDefaultsAndUpdateFromArgs(command_line);
 }
 
-void WorkerThread::OnShutdown() {
-  // The worker process is to be shut down gracefully. Ask the browser
-  // process to shut it down forcefully instead and wait on the message, so that
-  // there are no races between threads when the process is shutting down.
-  Send(new WorkerProcessHostMsg_ForceKillWorker());
-}
-
 WorkerThread::~WorkerThread() {
 }
 
@@ -98,15 +90,6 @@
   return handled;
 }
 
-bool WorkerThread::OnMessageReceived(const IPC::Message& msg) {
-  bool handled = true;
-  IPC_BEGIN_MESSAGE_MAP(WorkerThread, msg)
-    IPC_MESSAGE_HANDLER(ChildProcessMsg_Shutdown, OnShutdown)
-    IPC_MESSAGE_UNHANDLED(handled = ChildThread::OnMessageReceived(msg))
-  IPC_END_MESSAGE_MAP()
-  return handled;
-}
-
 void WorkerThread::OnCreateWorker(
     const WorkerProcessMsg_CreateWorker_Params& params) {
   WorkerAppCacheInitInfo appcache_init_info(