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Previously it was assumed that these values were always MediaTrackConstraints but http://dev.w3.org/2011/webrtc/editor/getusermedia.html#idl-def-MediaStreamConstraints allows them to be boolean, too. R=andrew@webrtc.org Review URL: https://webrtc-codereview.appspot.com/2352004 git-svn-id: http://webrtc.googlecode.com/svn/trunk@4918 4adac7df-926f-26a2-2b94-8c16560cd09d