Support multiple media tracks in MSE / ChunkDemuxer

media/filters/stream_parser_factory.cc

Index: media/filters/stream_parser_factory.cc
diff --git a/media/filters/stream_parser_factory.cc b/media/filters/stream_parser_factory.cc
index 5a95322bed0e06e861c6fe6dc8d44bac7f60d8f4..c67886aa84b9a27ddfb59480668e53969582719f 100644
--- a/media/filters/stream_parser_factory.cc
+++ b/media/filters/stream_parser_factory.cc
@@ -463,21 +463,14 @@ bool StreamParserFactory::IsTypeSupported(
 std::unique_ptr<StreamParser> StreamParserFactory::Create(
     const std::string& type,
     const std::vector<std::string>& codecs,
-    const scoped_refptr<MediaLog>& media_log,
-    bool* has_audio,
-    bool* has_video) {
+    const scoped_refptr<MediaLog>& media_log) {
   std::unique_ptr<StreamParser> stream_parser;
   ParserFactoryFunction factory_function;
   std::vector<CodecInfo::HistogramTag> audio_codecs;
   std::vector<CodecInfo::HistogramTag> video_codecs;
-  *has_audio = false;
-  *has_video = false;
 
   if (CheckTypeAndCodecs(type, codecs, media_log, &factory_function,
                          &audio_codecs, &video_codecs)) {
-    *has_audio = !audio_codecs.empty();
-    *has_video = !video_codecs.empty();
-
     // Log the number of codecs specified, as well as the details on each one.
     UMA_HISTOGRAM_COUNTS_100("Media.MSE.NumberOfTracks", codecs.size());
     for (size_t i = 0; i < audio_codecs.size(); ++i) {