andrewlewis e6ce6764d7 Clean up DefaultAudioSink
This is a first step towards factoring out position tracking functionality.

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Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=189027731
2018-03-27 23:46:04 +01:00
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2018-03-27 23:46:04 +01:00