09bf1a169b5347bae6fe9fe85ba290b029d0cf6b

Restores stored audio mode when all streaming stops. TBR=glaznev BUG=NONE TEST=AppRTCDemo Review URL: https://webrtc-codereview.appspot.com/46869005 Cr-Commit-Position: refs/heads/master@{#8970}
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