Moved default RTCPeerConnection to the front

lib/adapter.js

@@ -1,3 +1,3 @@
-exports.RTCSessionDescription = RTCSessionDescription || window.mozRTCSessionDescription || window.RTCSessionDescription;
-exports.RTCPeerConnection = RTCPeerConnection || window.mozRTCPeerConnection || window.webkitRTCPeerConnection || window.RTCPeerConnection;
-exports.RTCIceCandidate = RTCIceCandidate || window.mozRTCIceCandidate || window.RTCIceCandidate;
+exports.RTCSessionDescription = window.RTCSessionDescription || window.mozRTCSessionDescription;
+exports.RTCPeerConnection = window.RTCPeerConnection || window.mozRTCPeerConnection || window.webkitRTCPeerConnection;
+exports.RTCIceCandidate = window.RTCIceCandidate || window.mozRTCIceCandidate;