Bug 349379 - nsIUpdateTimerManager registerTimer is leaking. r=bsmedberg

toolkit/mozapps/update/src/nsUpdateService.js.in

@@ -2587,6 +2587,8 @@ TimerManager.prototype = {
      getObserverService().removeObserver(this, "xpcom-shutdown");
 
       // Release everything we hold onto. 
+      for (var timerID in this._timers)
+        delete this._timers[timerID];
       this._timer = null;
       this._timers = null;
     }