Issue 6110 - Add the iterator polyfills to the test page

polyfill.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
@@ skipping 119 matching lines @@
 
         if (locales.length == 0)
           return "";
 
         let locale = locales.shift();
         readCatalog(locale, "common.json");
         readCatalog(locale, catalogFile);
       }
     }
   };
+
+  // Workaround since HTMLCollection, NodeList, StyleSheetList, and CSSRuleList
+  // didn't have iterator support before Chrome 51.
+  // https://bugs.chromium.org/p/chromium/issues/detail?id=401699
+  for (let object of [HTMLCollection, NodeList, StyleSheetList, CSSRuleList])
+  {
+    if (!(Symbol.iterator in object.prototype))
+      object.prototype[Symbol.iterator] = Array.prototype[Symbol.iterator];
+  }
 }());