iwyu: Use callback_old.h where appropriate, part 1.

media/base/filters.h

 // Copyright (c) 2011 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.
 
 // Filters are connected in a strongly typed manner, with downstream filters
 // always reading data from upstream filters.  Upstream filters have no clue
 // who is actually reading from them, and return the results via callbacks.
 //
 //                         DemuxerStream(Video) <- VideoDecoder <- VideoRenderer
 // DataSource <- Demuxer <
 //                         DemuxerStream(Audio) <- AudioDecoder <- AudioRenderer
 //
 // Upstream -------------------------------------------------------> Downstream
 //                         <- Reads flow this way
 //                    Buffer assignments flow this way ->
 //
 // Every filter maintains a reference to the scheduler, who maintains data
 // shared between filters (i.e., reference clock value, playback state).  The
 // scheduler is also responsible for scheduling filter tasks (i.e., a read on
 // a VideoDecoder would result in scheduling a Decode task).  Filters can also
 // use the scheduler to signal errors and shutdown playback.
 
 #ifndef MEDIA_BASE_FILTERS_H_
 #define MEDIA_BASE_FILTERS_H_
 
 #include <limits>
 #include <string>
 
 #include "base/callback.h"
+#include "base/callback_old.h"
 #include "base/memory/ref_counted.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/time.h"
 #include "media/base/audio_decoder_config.h"
 #include "media/base/media_format.h"
 #include "media/base/video_frame.h"
 
 struct AVStream;
 
 namespace media {
@@ skipping 252 matching lines @@
   // buffer.
   virtual bool HasEnded() = 0;
 
   // Sets the output volume.
   virtual void SetVolume(float volume) = 0;
 };
 
 }  // namespace media
 
 #endif  // MEDIA_BASE_FILTERS_H_