Use a direct include of the message_loop header in media/.

media/audio/virtual_audio_output_stream_unittest.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 "base/bind.h"
 #include "base/bind_helpers.h"
-#include "base/message_loop.h"
+#include "base/message_loop/message_loop.h"
 #include "base/message_loop/message_loop_proxy.h"
 #include "base/synchronization/waitable_event.h"
 #include "base/threading/thread.h"
 #include "media/audio/audio_manager.h"
 #include "media/audio/simple_sources.h"
 #include "media/audio/virtual_audio_input_stream.h"
 #include "media/audio/virtual_audio_output_stream.h"
 #include "testing/gmock/include/gmock/gmock.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
@@ skipping 95 matching lines @@
                             base::Unretained(output_stream)));
 
   audio_message_loop()->PostTask(
       FROM_HERE, base::Bind(&MockVirtualAudioInputStream::Close,
                             base::Unretained(input_stream)));
 
   SyncWithAudioThread();
 }
 
 }  // namespace media