Fix potential flakiness in voe_auto_test.

BUG=
R=tina.legrand@webrtc.org

Review URL: https://webrtc-codereview.appspot.com/41929004

Cr-Commit-Position: refs/heads/master@{#8362}
git-svn-id: http://webrtc.googlecode.com/svn/trunk@8362 4adac7df-926f-26a2-2b94-8c16560cd09d
4 files changed