Issue 6564 - Replace desc and extend with __proto__

lib/coreUtils.js

Index: lib/coreUtils.js
===================================================================
--- a/lib/coreUtils.js
+++ b/lib/coreUtils.js
@@ -12,34 +12,16 @@
  * 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;