net: replace __defineGetter__ with defineProperty

`Object.prototype.__defineGetter__` is deprecated now, use
`Object.defineProperty` instead.

PR-URL: nodejs#6284
Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>

lib/net.js

@@ -587,19 +587,27 @@ Socket.prototype._getpeername = function() {
   return this._peername;
 };
 
-Socket.prototype.__defineGetter__('bytesRead', function() {
+function protoGetter(name, callback) {
+  Object.defineProperty(Socket.prototype, name, {
+    configurable: false,
+    enumerable: true,
+    get: callback
+  });
+}
+
+protoGetter('bytesRead', function bytesRead() {
   return this._handle ? this._handle.bytesRead : this[BYTES_READ];
 });
 
-Socket.prototype.__defineGetter__('remoteAddress', function() {
+protoGetter('remoteAddress', function remoteAddress() {
   return this._getpeername().address;
 });
 
-Socket.prototype.__defineGetter__('remoteFamily', function() {
+protoGetter('remoteFamily', function remoteFamily() {
   return this._getpeername().family;
 });
 
-Socket.prototype.__defineGetter__('remotePort', function() {
+protoGetter('remotePort', function remotePort() {
   return this._getpeername().port;
 });
 
@@ -618,12 +626,12 @@ Socket.prototype._getsockname = function() {
 };
 
 
-Socket.prototype.__defineGetter__('localAddress', function() {
+protoGetter('localAddress', function localAddress() {
   return this._getsockname().address;
 });
 
 
-Socket.prototype.__defineGetter__('localPort', function() {
+protoGetter('localPort', function localPort() {
   return this._getsockname().port;
 });
 
@@ -735,7 +743,7 @@ function createWriteReq(req, handle, data, encoding) {
 }
 
 
-Socket.prototype.__defineGetter__('bytesWritten', function() {
+protoGetter('bytesWritten', function bytesWritten() {
   var bytes = this._bytesDispatched;
   const state = this._writableState;
   const data = this._pendingData;