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

media/audio/virtual_audio_input_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 <list>
 
 #include "base/bind.h"
 #include "base/bind_helpers.h"
-#include "base/message_loop.h"
+#include "base/message_loop/message_loop.h"
 #include "base/rand_util.h"
 #include "base/synchronization/waitable_event.h"
 #include "base/threading/thread.h"
 #include "media/audio/audio_io.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 329 matching lines @@
   }
   RUN_ON_AUDIO_THREAD(Close);
   WaitUntilClosed();
 }
 
 INSTANTIATE_TEST_CASE_P(SingleVersusMultithreaded,
                         VirtualAudioInputStreamTest,
                         ::testing::Values(false, true));
 
 }  // namespace media