[MSAN] Initialize video_ and audio_track_id_ in media_unittest.

media/formats/mp2t/mp2t_stream_parser_unittest.cc

Index: media/formats/mp2t/mp2t_stream_parser_unittest.cc
diff --git a/media/formats/mp2t/mp2t_stream_parser_unittest.cc b/media/formats/mp2t/mp2t_stream_parser_unittest.cc
index b1374d2c95a3eee0a7cd2beba669ba2ddc856aff..0989b74c935669a1dc6b2b51a3d8aeee5ed4f9a7 100644
--- a/media/formats/mp2t/mp2t_stream_parser_unittest.cc
+++ b/media/formats/mp2t/mp2t_stream_parser_unittest.cc
@@ -64,7 +64,9 @@ class Mp2tStreamParserTest : public testing::Test {
         audio_min_dts_(kNoDecodeTimestamp()),
         audio_max_dts_(kNoDecodeTimestamp()),
         video_min_dts_(kNoDecodeTimestamp()),
-        video_max_dts_(kNoDecodeTimestamp()) {
+        video_max_dts_(kNoDecodeTimestamp()),
+        audio_track_id_(0),
+        video_track_id_(0) {
     bool has_sbr = false;
     parser_.reset(new Mp2tStreamParser(has_sbr));
   }