Fix use of uninitialized memory in RtpSenderTest::StreamDataCountersCallbacks

BUG=
R=stefan@webrtc.org

Review URL: https://webrtc-codereview.appspot.com/5229004

git-svn-id: http://webrtc.googlecode.com/svn/trunk/webrtc@5236 4adac7df-926f-26a2-2b94-8c16560cd09d
1 file changed