Add missing macros includes in media/.

media/midi/midi_scheduler.h

 // Copyright 2015 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_MIDI_MIDI_SCHEDULER_H_
 #define MEDIA_MIDI_MIDI_SCHEDULER_H_
 
 #include "base/callback.h"
+#include "base/macros.h"
 #include "base/memory/weak_ptr.h"
 #include "media/midi/midi_export.h"
 
 namespace media {
 namespace midi {
 
 class MidiManager;
 class MidiManagerClient;
 
 // TODO(crbug.com/467442): Make tasks cancelable per client.
@@ skipping 19 matching lines @@
   MidiManager* manager_;
   base::WeakPtrFactory<MidiScheduler> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(MidiScheduler);
 };
 
 }  // namespace midi
 }  // namespace media
 
 #endif  // MEDIA_MIDI_MIDI_SCHEDULER_H_