There should be no change in behavior, since this is what the default constructor does. BUG= R=jiayl@webrtc.org Review URL: https://webrtc-codereview.appspot.com/39419004 git-svn-id: http://webrtc.googlecode.com/svn/trunk@8007 4adac7df-926f-26a2-2b94-8c16560cd09d