Update adapter.js to use TURN transport parameters for FF version 27 & above.
Update adapter.js to use TURN transport parameters for FF version 27 & above.

R=juberti@google.com

Review URL: https://webrtc-codereview.appspot.com/2829004

git-svn-id: 917f5d3ca488f358c4d40eaec14422cf392ccec9@5031 4adac7df-926f-26a2-2b94-8c16560cd09d

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