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

media/audio/audio_input_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/basictypes.h"
 #include "base/environment.h"
 #include "base/memory/scoped_ptr.h"
-#include "base/message_loop.h"
+#include "base/message_loop/message_loop.h"
 #include "base/threading/platform_thread.h"
 #include "media/audio/audio_io.h"
 #include "media/audio/audio_manager_base.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 namespace media {
 
 static const int kSamplingRate = 8000;
 static const int kSamplesPerPacket = kSamplingRate / 20;
 
@@ skipping 157 matching lines @@
       base::TimeDelta::FromMilliseconds(690));
   message_loop.Run();
   EXPECT_GE(test_callback.callback_count(), 1);
   EXPECT_FALSE(test_callback.had_error());
 
   ais->Stop();
   ais->Close();
 }
 
 }  // namespace media