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

media/base/filter_factories.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_FILTER_FACTORIES_H_
 #define MEDIA_BASE_FILTER_FACTORIES_H_
 
 #include<string>
 
-#include "base/callback.h"
+#include "base/callback_old.h"
 #include "media/base/pipeline_status.h"
 
 namespace media {
 
 class DataSource;
 
 // Asynchronous factory interface for building DataSource objects.
 class DataSourceFactory {
  public:
   // Ownership of the DataSource is transferred through this callback.
@@ skipping 23 matching lines @@
   virtual void Build(const std::string& url, BuildCallback* callback) = 0;
 
   // Makes a copy of this factory.
   // NOTE: Pending requests are not cloned.
   virtual DemuxerFactory* Clone() const = 0;
 };
 
 }  // namespace media
 
 #endif  // MEDIA_BASE_FILTER_FACTORIES_H_