Bug 1290949: Test that removeTrack does not remove the associated sender. r=jib

MozReview-Commit-ID: ERg48fO9i6b

--HG--
extra : rebase_source : 0e2944e0c30a2811be3d198f8b6a7bd36d53692e

dom/media/tests/mochitest/test_peerConnection_transceivers.html

@@ -855,6 +855,12 @@
     await pc2.setLocalDescription(answer);
     pc1.removeTrack(pc1.getSenders()[0]);
 
+    hasProps(pc1.getSenders(),
+      [
+        {track: null},
+        {track: video}
+      ]);
+
     hasProps(pc1.getTransceivers(),
       [
         {
@@ -871,6 +877,12 @@
 
     pc1.removeTrack(pc1.getSenders()[1]);
 
+    hasProps(pc1.getSenders(),
+      [
+        {track: null},
+        {track: null}
+      ]);
+
     hasProps(pc1.getTransceivers(),
       [
         {