Fix loopback test for case where no constraint is given.
R=stefan@webrtc.org
TBR=stefan@webrtc.org

Review URL: https://webrtc-codereview.appspot.com/11619004

git-svn-id: http://webrtc.googlecode.com/svn/trunk/webrtc@5881 4adac7df-926f-26a2-2b94-8c16560cd09d
1 file changed