Issue 4353 - Remove deprecated __proto__ syntax

lib/coreUtils.js

+/*
+ * This file is part of Adblock Plus <https://adblockplus.org/>,
+ * Copyright (C) 2006-2016 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/>.
+ */
+
+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;