cluster: remove unused backlog argument

PR-URL: https://github.com/nodejs/node/pull/8877
Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Santiago Gimeno <santiago.gimeno@gmail.com>
Reviewed-By: Franziska Hinkelmann <franziska.hinkelmann@gmail.com>

lib/cluster.js

@@ -75,7 +75,7 @@ Worker.prototype.isConnected = function isConnected() {
 
 // Master/worker specific methods are defined in the *Init() functions.
 
-function SharedHandle(key, address, port, addressType, backlog, fd, flags) {
+function SharedHandle(key, address, port, addressType, fd, flags) {
   this.key = key;
   this.workers = [];
   this.handle = null;
@@ -113,7 +113,7 @@ SharedHandle.prototype.remove = function(worker) {
 
 // Start a round-robin server. Master accepts connections and distributes
 // them over the workers.
-function RoundRobinHandle(key, address, port, addressType, backlog, fd) {
+function RoundRobinHandle(key, address, port, addressType, fd) {
   this.key = key;
   this.all = {};
   this.free = [];
@@ -493,7 +493,6 @@ function masterInit() {
                                               message.address,
                                               message.port,
                                               message.addressType,
-                                              message.backlog,
                                               message.fd,
                                               message.flags);
     }