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

webkit/glue/media/web_data_source.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 WEBKIT_GLUE_MEDIA_WEB_DATA_SOURCE_H_
 #define WEBKIT_GLUE_MEDIA_WEB_DATA_SOURCE_H_
 
+#include "base/callback_old.h"
 #include "media/base/filters.h"
 #include "media/base/pipeline_status.h"
 
 namespace webkit_glue {
 
 // An interface that allows WebMediaPlayerImpl::Proxy to communicate with the
 // DataSource in the pipeline.
 class WebDataSource : public media::DataSource {
  public:
   WebDataSource();
@@ skipping 31 matching lines @@
 // once WebMediaPlayerImpl::Proxy is fixed so it doesn't have to track
 // WebDataSources. Proxy only has to track WebDataSources so it can call Abort()
 // on them at shutdown. Once cancellation is added to DataSource and pause
 // support in Demuxers cancel pending reads, Proxy shouldn't have to keep
 // a WebDataSource list or call Abort().
 typedef Callback1<WebDataSource*>::Type WebDataSourceBuildObserverHack;
 
 }  // namespace webkit_glue
 
 #endif  // WEBKIT_GLUE_MEDIA_WEB_DATA_SOURCE_H_