Use a direct include of the message_loop header in content/, part 4.

content/renderer/active_notification_tracker.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/renderer/active_notification_tracker.h"
 
 #include "base/memory/scoped_ptr.h"
-#include "base/message_loop.h"
+#include "base/message_loop/message_loop.h"
 #include "third_party/WebKit/public/web/WebNotification.h"
 #include "third_party/WebKit/public/web/WebNotificationPermissionCallback.h"
 
 using WebKit::WebNotification;
 using WebKit::WebNotificationPermissionCallback;
 
 namespace content {
 
 ActiveNotificationTracker::ActiveNotificationTracker() {}
 
@@ skipping 65 matching lines @@
 int ActiveNotificationTracker::RegisterPermissionRequest(
     WebNotificationPermissionCallback* callback) {
   return callback_table_.Add(callback);
 }
 
 void ActiveNotificationTracker::OnPermissionRequestComplete(int id) {
   callback_table_.Remove(id);
 }
 
 }  // namespace content