module: Remove deprecated function requireRepl.

Refs: https://github.com/nodejs/node/issues/4642
PR-URL: https://github.com/nodejs/node/pull/8575
Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>
Reviewed-By: Сковорода Никита Андреевич <chalkerx@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>

lib/module.js

@@ -3,7 +3,6 @@
 const NativeModule = require('native_module');
 const util = require('util');
 const internalModule = require('internal/module');
-const internalUtil = require('internal/util');
 const vm = require('vm');
 const assert = require('assert').ok;
 const fs = require('fs');
@@ -640,11 +639,6 @@ Module._initPaths = function() {
   Module.globalPaths = modulePaths.slice(0);
 };
 
-// TODO(bnoordhuis) Unused, remove in the future.
-Module.requireRepl = internalUtil.deprecate(function() {
-  return NativeModule.require('internal/repl');
-}, 'Module.requireRepl is deprecated.');
-
 Module._preloadModules = function(requests) {
   if (!Array.isArray(requests))
     return;