Mojify demuxers and allow running {Chunk/FFmpeg}Demuxer in a Utility Process

media/filters/ffmpeg_demuxer.cc

Index: media/filters/ffmpeg_demuxer.cc
diff --git a/media/filters/ffmpeg_demuxer.cc b/media/filters/ffmpeg_demuxer.cc
index 249f97a0c731cb5a627696d2df6f1b886ae76a6a..30149438c8001be72673291feba9eeee894d2216 100644
--- a/media/filters/ffmpeg_demuxer.cc
+++ b/media/filters/ffmpeg_demuxer.cc
@@ -47,6 +47,8 @@
 
 namespace media {
 
+namespace {
+
 static base::Time ExtractTimelineOffset(AVFormatContext* format_context) {
   if (strstr(format_context->iformat->name, "webm") ||
       strstr(format_context->iformat->name, "matroska")) {
@@ -198,6 +200,12 @@ static void SetTimeProperty(MediaLogEvent* event,
     event->params.SetDouble(key, value.InSecondsF());
 }
 
+static void UnmarkEndOfStream(AVFormatContext* format_context) {
+  format_context->pb->eof_reached = 0;
+}
+
+}  // namespace
+
 std::unique_ptr<FFmpegDemuxerStream> FFmpegDemuxerStream::Create(
     FFmpegDemuxer* demuxer,
     AVStream* stream,
@@ -249,10 +257,6 @@ std::unique_ptr<FFmpegDemuxerStream> FFmpegDemuxerStream::Create(
       demuxer, stream, std::move(audio_config), std::move(video_config)));
 }
 
-static void UnmarkEndOfStream(AVFormatContext* format_context) {
-  format_context->pb->eof_reached = 0;
-}
-
 //
 // FFmpegDemuxerStream
 //