fixing a bug in GetPlayoutDeviceName, previously it returns name as guid.

Bug=http://code.google.com/p/webrtc/issues/detail?id=77
Test=none
Review URL: http://webrtc-codereview.appspot.com/135011

git-svn-id: http://webrtc.googlecode.com/svn/trunk@528 4adac7df-926f-26a2-2b94-8c16560cd09d
1 file changed