Allow mp3 audio codec for mpeg2ts containers in MSE

media/base/audio_codecs.cc

Index: media/base/audio_codecs.cc
diff --git a/media/base/audio_codecs.cc b/media/base/audio_codecs.cc
index 09b191000b52b1148567b05ea17b4297937ad873..ea5bafa0229aefa8db043c4126e9db9ff1a57f97 100644
--- a/media/base/audio_codecs.cc
+++ b/media/base/audio_codecs.cc
@@ -56,7 +56,7 @@ AudioCodec StringToAudioCodec(const std::string& codec_id) {
     return kCodecAC3;
   if (codec_id == "ec-3" || codec_id == "mp4a.A6" || codec_id == "mp4a.a6")
     return kCodecEAC3;
-  if (codec_id == "mp3")
+  if (codec_id == "mp3" || codec_id == "mp4a.69" || codec_id == "mp4a.6B")
     return kCodecMP3;
   if (codec_id == "alac")
     return kCodecALAC;