Fix audio keyframe comment in MSE MP4 parser

media/formats/mp4/track_run_iterator.cc

Index: media/formats/mp4/track_run_iterator.cc
diff --git a/media/formats/mp4/track_run_iterator.cc b/media/formats/mp4/track_run_iterator.cc
index 25fc5ec5c7867409eff65f88bf5d68929caee9b8..f109873b27a19251a5b9d2f4424fb26e31e7f912 100644
--- a/media/formats/mp4/track_run_iterator.cc
+++ b/media/formats/mp4/track_run_iterator.cc
@@ -169,11 +169,11 @@ static bool PopulateSampleInfo(const TrackExtends& trex,
   // that marks non-key video frames as sync samples (http://crbug.com/507916
   // and http://crbug.com/310712). Hence, for video we additionally check that
   // the sample does not depend on others (FFmpeg does too, see mov_read_trun).
-  // Sample dependency is not ignored for audio because encoded audio samples
-  // can depend on other samples and still be used for random access. Generally
-  // all audio samples are expected to be sync samples, but we  prefer to check
-  // the flags to catch badly muxed audio (for now anyway ;P). History of
-  // attempts to get this right discussed in http://crrev.com/1319813002
+  // Sample dependency is ignored for audio because encoded audio samples can
+  // depend on other samples and still be used for random access. Generally all
+  // audio samples are expected to be sync samples, but we  prefer to check the
+  // flags to catch badly muxed audio (for now anyway ;P). History of attempts
+  // to get this right discussed in http://crrev.com/1319813002
   bool sample_is_sync_sample = !(flags & kSampleIsNonSyncSample);
   bool sample_depends_on_others = sample_depends_on == kSampleDependsOnOthers;
   sample_info->is_keyframe = sample_is_sync_sample &&