Issue 5773 - Polyfill iterator for CSSRuleList and StyleSheetList

ext/common.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 33 matching lines @@
     {
       let results = [];
 
       for (let listener of this._listeners)
         results.push(listener(...args));
 
       return results;
     }
   };
 
-  // Workaround since HTMLCollection and NodeList didn't have iterator support
-  // before Chrome 51.
+  // Workaround since HTMLCollection, NodeList, StyleSheet and
+  // CSSRuleList didn't have iterator support before Chrome 51.
   // https://bugs.chromium.org/p/chromium/issues/detail?id=401699
   let arrayIterator = Array.prototype[Symbol.iterator];
   if (!(Symbol.iterator in HTMLCollection.prototype))
     HTMLCollection.prototype[Symbol.iterator] = arrayIterator;
   if (!(Symbol.iterator in NodeList.prototype))
     NodeList.prototype[Symbol.iterator] = arrayIterator;
+  if (!(Symbol.iterator in StyleSheetList.prototype))
+    StyleSheetList.prototype[Symbol.iterator] = arrayIterator;
+  if (!(Symbol.iterator in CSSRuleList.prototype))
+    CSSRuleList.prototype[Symbol.iterator] = arrayIterator;
 
   /* Message passing */
 
   ext.onMessage = new ext._EventTarget();
 
 
   /* Background page */
 
   ext.backgroundPage = {
     sendMessage: chrome.runtime.sendMessage,
     getWindow()
     {
       return chrome.extension.getBackgroundPage();
     }
   };
 
 
   /* Utils */
 
   ext.getURL = chrome.extension.getURL;
   ext.i18n = chrome.i18n;
 }());