Use toJS in RTCRtp receiver and sender

Author: renefloor

lib/src/rtc_rtp_receiver_impl.dart

@@ -30,7 +30,7 @@ class RTCRtpReceiverWeb extends RTCRtpReceiver {
             value.getProperty<JSString>('type'.toJS).toDart,
             value.getProperty<JSNumber>('timestamp'.toJS).toDartDouble,
             stats));
-      }.jsify()
+      }.toJS,
     ]);
     return report;
   }

lib/src/rtc_rtp_sender_impl.dart

@@ -98,7 +98,7 @@ class RTCRtpSenderWeb extends RTCRtpSender {
             value.getProperty<JSString>('type'.toJS).toDart,
             value.getProperty<JSNumber>('timestamp'.toJS).toDartDouble,
             stats));
-      }.jsify()
+      }.toJS,
     ]);
     return report;
   }