Add missing macros includes in media/.

media/audio/scoped_task_runner_observer.h

 // 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.
 
 #ifndef MEDIA_AUDIO_SCOPED_TASK_RUNNER_OBSERVER_H_
 #define MEDIA_AUDIO_SCOPED_TASK_RUNNER_OBSERVER_H_
 
+#include "base/macros.h"
 #include "base/memory/ref_counted.h"
 #include "base/message_loop/message_loop.h"
 
 namespace base {
 class SingleThreadTaskRunner;
 class WaitableEvent;
 }
 
 namespace media {
 
@@ skipping 25 matching lines @@
   // A pointer to the task runner. In case it gets destroyed before this object
   // goes out of scope, PostTask() etc will fail but not crash.
   scoped_refptr<base::SingleThreadTaskRunner> task_runner_;
 
   DISALLOW_COPY_AND_ASSIGN(ScopedTaskRunnerObserver);
 };
 
 }  // namespace media.
 
 #endif  // MEDIA_AUDIO_SCOPED_TASK_RUNNER_OBSERVER_H_