WebRtcPeer.js FIXME can now be implemented

[M-Dominguez]

I was looking at the internals of my webrtc connection on chrome through chrome://webrtc-internals/. I noticed that my connection where not being closed. did some searching and found this FIXME that doesnt seem to be touch in years.

 // FIXME This is not yet implemented in firefox
 // if(videoStream) pc.removeStream(videoStream);
 // if(audioStream) pc.removeStream(audioStream);

The proper way to "removeStream" is thorugh the function removeTrack()

pc.getSenders().forEach((sender) => {
       logger.debug('Remove track for sender: ' + sender)
       pc.removeTrack(sender);
});

Is WebRtcPeer.js still supported? If not, this may be a moot point.