_sendUnified(methodName, methodData, callback) {
		let Proto = protobufs[methodName + (callback ? '_Request' : '')];
		let header = {
			msg: EMsg.ServiceMethodCallFromClient,
			proto: {
				target_job_name: methodName
			}
		};

		this._send(header, SteamUserMessages._encodeProto(Proto, methodData), callback);
	}
Send a unified message.
@param {string} methodName - In format Interface.Method#Version, e.g. Foo.DoThing#1
@param {object} methodData
@param {function} [callback]
@protected