Issue 3380 - synchronizer unit tests are broken

lib/synchronizer.js

Index: lib/synchronizer.js
===================================================================
--- a/lib/synchronizer.js
+++ b/lib/synchronizer.js
@@ -22,31 +22,31 @@
 Cu.import("resource://gre/modules/XPCOMUtils.jsm");
 Cu.import("resource://gre/modules/Services.jsm");
 
-let {Downloader, Downloadable,
+var {Downloader, Downloadable,
     MILLIS_IN_SECOND, MILLIS_IN_MINUTE, MILLIS_IN_HOUR, MILLIS_IN_DAY} = require("downloader");
-let {Filter, CommentFilter} = require("filterClasses");
-let {FilterStorage} = require("filterStorage");
-let {FilterNotifier} = require("filterNotifier");
-let {Prefs} = require("prefs");
-let {Subscription, DownloadableSubscription} = require("subscriptionClasses");
-let {Utils} = require("utils");
+var {Filter, CommentFilter} = require("filterClasses");
+var {FilterStorage} = require("filterStorage");
+var {FilterNotifier} = require("filterNotifier");
+var {Prefs} = require("prefs");
+var {Subscription, DownloadableSubscription} = require("subscriptionClasses");
+var {Utils} = require("utils");
 
-let INITIAL_DELAY = 1 * MILLIS_IN_MINUTE;
-let CHECK_INTERVAL = 1 * MILLIS_IN_HOUR;
-let DEFAULT_EXPIRATION_INTERVAL = 5 * MILLIS_IN_DAY;
+var INITIAL_DELAY = 1 * MILLIS_IN_MINUTE;
+var CHECK_INTERVAL = 1 * MILLIS_IN_HOUR;
+var DEFAULT_EXPIRATION_INTERVAL = 5 * MILLIS_IN_DAY;
 
 /**
  * The object providing actual downloading functionality.
  * @type Downloader
  */
-let downloader = null;
+var downloader = null;
 
 /**
  * This object is responsible for downloading filter subscriptions whenever
  * necessary.
  * @class
  */
-let Synchronizer = exports.Synchronizer =
+var Synchronizer = exports.Synchronizer =
 {
   /**
    * Called on module startup.