Use callback_forward.h instead of callback.h where possible.

media/base/mock_reader.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.
 
 #ifndef MEDIA_BASE_MOCK_READER_H_
 #define MEDIA_BASE_MOCK_READER_H_
 
 #include <string>
 
 #include "base/bind.h"
-#include "base/callback.h"
 #include "base/memory/ref_counted.h"
 #include "media/base/filters.h"
 
 namespace media {
 
 // Ref counted object so we can create callbacks for asynchronous Read()
 // methods for any filter type.
 template <class FilterType, class BufferType>
 class MockReader
     : public base::RefCountedThreadSafe<MockReader<FilterType, BufferType> > {
@@ skipping 47 matching lines @@
 
   DISALLOW_COPY_AND_ASSIGN(MockReader);
 };
 
 // Commonly used reader types.
 typedef MockReader<DemuxerStream, Buffer> DemuxerStreamReader;
 
 }  // namespace media
 
 #endif  // MEDIA_BASE_MOCK_READER_H_