code: func (c *Cast) StopCastingWithParams(v *CastStopCastingParams) (*gcdmessage.ChromeResponse, error) {
  	return gcdmessage.SendDefaultRequest(c.target, c.target.GetSendCh(), &gcdmessage.ParamRequest{Id: c.target.GetId(), Method: "Cast.stopCasting", Params: v})
  }
docs: // StopCastingWithParams - Stops the active Cast session on the sink.