Issue 6564 - Replace desc and extend with __proto__

lib/coreUtils.js

 /*
  * This file is part of Adblock Plus <https://adblockplus.org/>,
  * Copyright (C) 2006-present eyeo GmbH
  *
  * Adblock Plus is free software: you can redistribute it and/or modify
  * it under the terms of the GNU General Public License version 3 as
  * published by the Free Software Foundation.
  *
  * Adblock Plus is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  * GNU General Public License for more details.
  *
  * You should have received a copy of the GNU General Public License
  * along with Adblock Plus.  If not, see <http://www.gnu.org/licenses/>.
  */
 
 "use strict";
 
-function desc(properties)
-{
-  let descriptor = {};
-  let keys = Object.keys(properties);
-
-  for (let key of keys)
-    descriptor[key] = Object.getOwnPropertyDescriptor(properties, key);
-
-  return descriptor;
-}
-exports.desc = desc;
-
-function extend(cls, properties)
-{
-  return Object.create(cls.prototype, desc(properties));
-}
-exports.extend = extend;
-
 function findIndex(iterable, callback, thisArg)
 {
   let index = 0;
   for (let item of iterable)
   {
     if (callback.call(thisArg, item))
       return index;
 
     index++;
   }
 
   return -1;
 }
 exports.findIndex = findIndex;
 
 function indexOf(iterable, searchElement)
 {
   return findIndex(iterable, item => item === searchElement);
 }
 exports.indexOf = indexOf;