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

content/browser/geolocation/mock_location_arbitrator.cc

 // Copyright (c) 2012 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/browser/geolocation/mock_location_arbitrator.h"
 
-#include "base/message_loop.h"
+#include "base/message_loop/message_loop.h"
 #include "content/public/common/geoposition.h"
 
 namespace content {
 
 MockGeolocationArbitrator::MockGeolocationArbitrator()
     : permission_granted_(false),
       providers_started_(false) {
 }
 
 void MockGeolocationArbitrator::StartProviders(bool use_high_accuracy) {
   providers_started_ = true;;
 }
 
 void MockGeolocationArbitrator::StopProviders() {
   providers_started_ = false;
 }
 
 void MockGeolocationArbitrator::OnPermissionGranted() {
   permission_granted_ = true;
 }
 
 bool MockGeolocationArbitrator::HasPermissionBeenGranted() const {
   return permission_granted_;
 }
 
 }  // namespace content