removeTrack method
Implementation
@override
Future<bool> removeTrack(RTCRtpSender sender) async {
var nativeSender = sender as RTCRtpSenderWeb;
// var nativeTrack = nativeSender.track as MediaStreamTrackWeb;
jsutil.callMethod(_jsPc, 'removeTrack', [nativeSender.jsRtpSender]);
return Future<bool>.value(true);
}