Use a direct include of the message_loop header in content/, part 2.

content/browser/renderer_host/media/audio_mirroring_manager_unittest.cc

 // Copyright (c) 2013 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/renderer_host/media/audio_mirroring_manager.h"
 
 #include <map>
 
 #include "base/bind.h"
 #include "base/bind_helpers.h"
-#include "base/message_loop.h"
+#include "base/message_loop/message_loop.h"
 #include "base/synchronization/waitable_event.h"
 #include "content/browser/browser_thread_impl.h"
 #include "media/audio/audio_parameters.h"
 #include "testing/gmock/include/gmock/gmock.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 using media::AudioOutputStream;
 using media::AudioParameters;
 using testing::_;
 using testing::NotNull;
@@ skipping 203 matching lines @@
                   yet_another_destination);
 
   StopMirroringTo(kRenderProcessId, kRenderViewId, destination);
 
   KillStream(kAnotherRenderProcessId, kAnotherRenderViewId, another_stream);
   KillStream(kYetAnotherRenderProcessId, kYetAnotherRenderViewId,
              yet_another_stream);
 }
 
 }  // namespace content