Switch to AVIO instead of a custom FFmpeg URLProtocol handler.

media/ffmpeg/ffmpeg_common.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.
 
 #ifndef MEDIA_FFMPEG_FFMPEG_COMMON_H_
 #define MEDIA_FFMPEG_FFMPEG_COMMON_H_
 
 // Used for FFmpeg error codes.
 #include <cerrno>
 
@@ skipping 86 matching lines @@
 
 // Converts video formats to its corresponding FFmpeg's pixel formats.
 PixelFormat VideoFormatToPixelFormat(VideoFrame::Format video_format);
 
 // Converts an FFmpeg video codec ID into its corresponding supported codec id.
 VideoCodec CodecIDToVideoCodec(CodecID codec_id);
 
 // Converts an FFmpeg audio codec ID into its corresponding supported codec id.
 AudioCodec CodecIDToAudioCodec(CodecID codec_id);
 
-// Closes & destroys all AVStreams in the context and then closes &
-// destroys the AVFormatContext.
-void DestroyAVFormatContext(AVFormatContext* format_context);
-
 }  // namespace media
 
 #endif  // MEDIA_FFMPEG_FFMPEG_COMMON_H_