Use a direct include of the message_loop header in webkit/, part 1.

webkit/browser/appcache/mock_appcache_service.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 "webkit/browser/appcache/mock_appcache_service.h"
 
 #include "base/bind.h"
-#include "base/message_loop.h"
+#include "base/message_loop/message_loop.h"
 
 namespace appcache {
 
 static void DeferredCallCallback(
     const net::CompletionCallback& callback, int rv) {
   callback.Run(rv);
 }
 
 void MockAppCacheService::DeleteAppCachesForOrigin(
     const GURL& origin, const net::CompletionCallback& callback) {
   ++delete_called_count_;
   base::MessageLoop::current()->PostTask(
       FROM_HERE,
       base::Bind(&DeferredCallCallback,
                  callback,
                  mock_delete_appcaches_for_origin_result_));
 }
 
 }  // namespace appcache