Start/stop WebKitThread from BrowserMainLoop like other BrowserThreads.

content/shell/shell_browser_main.cc

 // Copyright (c) 2011 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "content/shell/shell_browser_main.h"
 
 #include "base/bind.h"
 #include "base/command_line.h"
 #include "base/message_loop.h"
 #include "base/threading/thread.h"
@@ skipping 49 matching lines @@
 void ShellBrowserMainParts::PostMainMessageLoopRun() {
   browser_context_.reset();
 
   resource_dispatcher_host_->download_file_manager()->Shutdown();
   resource_dispatcher_host_->save_file_manager()->Shutdown();
   resource_dispatcher_host_->Shutdown();
 }
 
 void ShellBrowserMainParts::PreStopThread(BrowserThread::ID id) {
   if (id == BrowserThread::WEBKIT) {
-    // It remains the embedder's responsibility to kill the WebKit
-    // thread.  This happens when RDH is destroyed.
     resource_dispatcher_host_.reset();
   }
 }
 
 bool ShellBrowserMainParts::MainMessageLoopRun(int* result_code) {
   return false;
 }
 
 ResourceDispatcherHost* ShellBrowserMainParts::GetResourceDispatcherHost() {
   if (!resource_dispatcher_host_.get()) {
     ResourceQueue::DelegateSet resource_queue_delegates;
     resource_dispatcher_host_.reset(
         new ResourceDispatcherHost(resource_queue_delegates));
     resource_dispatcher_host_->Initialize();
   }
   return resource_dispatcher_host_.get();
 }
 
 ui::Clipboard* ShellBrowserMainParts::GetClipboard() {
   if (!clipboard_.get())
     clipboard_.reset(new ui::Clipboard());
   return clipboard_.get();
 }
 
 }  // namespace