Fix mpeg-1 layer2 parsing typo.

media/formats/mpeg/mpeg1_audio_stream_parser.cc

Index: media/formats/mpeg/mpeg1_audio_stream_parser.cc
diff --git a/media/formats/mpeg/mpeg1_audio_stream_parser.cc b/media/formats/mpeg/mpeg1_audio_stream_parser.cc
index bf5d1cbdef45f74bece282c9ba425f3cf21a529b..a86c1e1b1ae07cb008d239074bede92cdcb4faef 100644
--- a/media/formats/mpeg/mpeg1_audio_stream_parser.cc
+++ b/media/formats/mpeg/mpeg1_audio_stream_parser.cc
@@ -138,7 +138,7 @@ bool MPEG1AudioStreamParser::ParseHeader(
     return false;
   }
 
-  if (layer == kLayer2 && kIsAllowed[bitrate_index][channel_mode]) {
+  if (layer == kLayer2 && !kIsAllowed[bitrate_index][channel_mode]) {
     MEDIA_LOG(ERROR, media_log) << "Invalid (bitrate_index, channel_mode)"
                                 << " combination :" << std::hex
                                 << " bitrate_index " << bitrate_index