Issue 3379 - filterListener unit tests are broken

lib/elemHide.js

 /*
  * This file is part of Adblock Plus <https://adblockplus.org/>,
  * Copyright (C) 2006-2015 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/>.
  */
 
 /**
  * @fileOverview Element hiding implementation.
  */
 
 Cu.import("resource://gre/modules/Services.jsm");
 
-let {Utils} = require("utils");
-let {IO} = require("io");
-let {Prefs} = require("prefs");
-let {ElemHideException} = require("filterClasses");
-let {FilterNotifier} = require("filterNotifier");
+var {Utils} = require("utils");
+var {IO} = require("io");
+var {Prefs} = require("prefs");
+var {ElemHideException} = require("filterClasses");
+var {FilterNotifier} = require("filterNotifier");
 
 /**
  * Lookup table, filters by their associated key
  * @type Object
  */
-let filterByKey = Object.create(null);
+var filterByKey = Object.create(null);
 
 /**
  * Lookup table, keys of the filters by filter text
  * @type Object
  */
-let keyByFilter = Object.create(null);
+var keyByFilter = Object.create(null);
 
 /**
  * Lookup table, keys are known element hiding exceptions
  * @type Object
  */
-let knownExceptions = Object.create(null);
+var knownExceptions = Object.create(null);
 
 /**
  * Lookup table, lists of element hiding exceptions by selector
  * @type Object
  */
-let exceptions = Object.create(null);
+var exceptions = Object.create(null);
 
 /**
  * Currently applied stylesheet URL
  * @type nsIURI
  */
-let styleURL = null;
+var styleURL = null;
 
 /**
  * Element hiding component
  * @class
  */
-let ElemHide = exports.ElemHide =
+var ElemHide = exports.ElemHide =
 {
   /**
    * Indicates whether filters have been added or removed since the last apply() call.
    * @type Boolean
    */
   isDirty: false,
 
   /**
    * Inidicates whether the element hiding stylesheet is currently applied.
    * @type Boolean
@@ skipping 305 matching lines @@
       let filter = filterByKey[key];
       if (specificOnly && (!filter.domains || filter.domains[""]))
         continue;
 
       if (filter.isActiveOnDomain(domain) && !this.getException(filter, domain))
         result.push(filter.selector);
     }
     return result;
   }
 };