if (typeof mocks.RTCIceCandidate !== "undefined") {
    this.RTCIceCandidate = mocks.RTCIceCandidate;
  } else if (typeof RTCIceCandidate !== "undefined") {
    this.RTCIceCandidate = RTCIceCandidate;
  } else if (typeof mozRTCIceCandidate !== "undefined") {