RoboErik 165809b331 Send volume keys to the default stream if not actually playing
This ensures that we'll only adjust volume on a session's stream if
that stream is actually in use.

bug:17690423
Change-Id: I5fce8265a015bbc5034afa16719d9a0bbf257598
2014-09-29 14:43:10 -07:00
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