Convert USE_PROPRIETARY_CODECS to a buildflag header.

media/filters/ffmpeg_demuxer.h

 // Copyright (c) 2012 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.
 
 // Implements the Demuxer interface using FFmpeg's libavformat.  At this time
 // will support demuxing any audio/video format thrown at it.  The streams
 // output mime types audio/x-ffmpeg and video/x-ffmpeg and include an integer
 // key FFmpegCodecID which contains the CodecID enumeration value.  The CodecIDs
 // can be used to create and initialize the corresponding FFmpeg decoder.
 //
@@ skipping 24 matching lines @@
 #include "base/threading/thread.h"
 #include "media/base/audio_decoder_config.h"
 #include "media/base/decoder_buffer.h"
 #include "media/base/decoder_buffer_queue.h"
 #include "media/base/demuxer.h"
 #include "media/base/pipeline_status.h"
 #include "media/base/text_track_config.h"
 #include "media/base/video_decoder_config.h"
 #include "media/ffmpeg/ffmpeg_deleters.h"
 #include "media/filters/blocking_url_protocol.h"
+#include "media/media_features.h"
 
 // FFmpeg forward declarations.
 struct AVFormatContext;
 struct AVPacket;
 struct AVRational;
 struct AVStream;
 
 namespace media {
 
 class MediaLog;
@@ skipping 129 matching lines @@
   Ranges<base::TimeDelta> buffered_ranges_;
   VideoRotation video_rotation_;
   bool is_enabled_;
   bool waiting_for_keyframe_;
   bool aborted_;
 
   DecoderBufferQueue buffer_queue_;
   ReadCB read_cb_;
   StreamStatusChangeCB stream_status_change_cb_;
 
-#if defined(USE_PROPRIETARY_CODECS)
+#if BUILDFLAG(USE_PROPRIETARY_CODECS)
   std::unique_ptr<FFmpegBitstreamConverter> bitstream_converter_;
 #endif
 
   std::string encryption_key_id_;
   bool fixup_negative_timestamps_;
 
   DISALLOW_COPY_AND_ASSIGN(FFmpegDemuxerStream);
 };
 
 class MEDIA_EXPORT FFmpegDemuxer : public Demuxer {
@@ skipping 160 matching lines @@
   base::WeakPtr<FFmpegDemuxer> weak_this_;
   base::WeakPtrFactory<FFmpegDemuxer> cancel_pending_seek_factory_;
   base::WeakPtrFactory<FFmpegDemuxer> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(FFmpegDemuxer);
 };
 
 }  // namespace media
 
 #endif  // MEDIA_FILTERS_FFMPEG_DEMUXER_H_