Made Synchronizer tests work again

chrome/content/common.js

Index: chrome/content/common.js
===================================================================
--- a/chrome/content/common.js
+++ b/chrome/content/common.js
@@ -1,13 +1,14 @@
 const Cc = Components.classes;
 const Ci = Components.interfaces;
 const Cr = Components.results;
 const Cu = Components.utils;
 
+Cu.import("resource://gre/modules/XPCOMUtils.jsm");
 Cu.import("resource://gre/modules/Services.jsm");
 
 function require(module)
 {
   let result = {};
   result.wrappedJSObject = result;
   Services.obs.notifyObservers(result, "adblockplus-require", module);
   return result.exports;
@@ -36,16 +37,17 @@ let {Subscription, SpecialSubscription, 
      ExternalSubscription, DownloadableSubscription} = require("subscriptionClasses");
 let {defaultMatcher, Matcher, CombinedMatcher} = require("matcher");
 let {FilterListener} = require("filterListener");
 let {FilterNotifier} = require("filterNotifier");
 let {FilterStorage} = require("filterStorage");
 let {ElemHide} = require("elemHide");
 let {Prefs} = require("prefs");
 let {RequestNotifier} = require("requestNotifier");
+let {Synchronizer} = require("synchronizer");
 let {UI} = require("ui");
 let {Utils} = require("utils");
 
 let geckoVersion = Services.appinfo.platformVersion;
 function compareGeckoVersion(version)
 {
   return Services.vc.compare(geckoVersion, version);
 }