SDK / exoplayer

The old tag reflects the original name of this class. It was renamed in
2017:
<unknown commit>

Possibly the old name was kept for compatibility with existing logs
analysis? I didn't see an explicit discussion of this in the review
comments of the rename change.

The current tag confused me slightly - I assumed a line was being
emitted by the android.media.AudioTrack rather than ExoPlayer's
DefaultAudioSink.

PiperOrigin-RevId: 345450056