Bug 1535442 - Part 4: Put the ufrag in the right attribute, and handle end-of-candidates. r=jib

Differential Revision: https://phabricator.services.mozilla.com/D24278

--HG--
extra : moz-landing-system : lando

dom/media/PeerConnection.jsm

@@ -1697,13 +1697,13 @@ class PeerConnectionObserver {
     this._dompc._onAddIceCandidateError(this.newError(message, code));
   }
 
-  onIceCandidate(sdpMLineIndex, sdpMid, candidate, ufrag) {
+  onIceCandidate(sdpMLineIndex, sdpMid, candidate, usernameFragment) {
     let win = this._dompc._win;
-    if (candidate) {
+    if (candidate || sdpMid || usernameFragment) {
       if (candidate.includes(" typ relay ")) {
         this._dompc._iceGatheredRelayCandidates = true;
       }
-      candidate = new win.RTCIceCandidate({ candidate, sdpMid, sdpMLineIndex, ufrag });
+      candidate = new win.RTCIceCandidate({ candidate, sdpMid, sdpMLineIndex, usernameFragment });
     } else {
       candidate = null;
     }