domain: converted anonymous to named function

PR-URL: #20021
Reviewed-By: Trivikram Kamat <trivikr.dev@gmail.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de>
Reviewed-By: Matteo Collina <matteo.collina@gmail.com>

lib/domain.js

@@ -184,7 +184,7 @@ class Domain extends EventEmitter {
 
 exports.Domain = Domain;
 
-exports.create = exports.createDomain = function() {
+exports.create = exports.createDomain = function createDomain() {
   return new Domain();
 };
 
@@ -193,7 +193,7 @@ exports.active = null;
 Domain.prototype.members = undefined;
 
 // Called by process._fatalException in case an error was thrown.
-Domain.prototype._errorHandler = function _errorHandler(er) {
+Domain.prototype._errorHandler = function(er) {
   var caught = false;
 
   if (!util.isPrimitive(er)) {
@@ -428,7 +428,7 @@ EventEmitter.init = function() {
 };
 
 const eventEmit = EventEmitter.prototype.emit;
-EventEmitter.prototype.emit = function emit(...args) {
+EventEmitter.prototype.emit = function(...args) {
   const domain = this.domain;
 
   const type = args[0];