Bug 619026 - Scope timer variable so it is not at risk of being garbage collected. r=hsivonen

parser/htmlparser/tests/mochitest/file_bug543062.sjs

@@ -1,5 +1,7 @@
+var timer;
+
 function armTimer(response) {
-  var timer = Components.classes["@mozilla.org/timer;1"]
+  timer = Components.classes["@mozilla.org/timer;1"]
     .createInstance(Components.interfaces.nsITimer);
   timer.initWithCallback(function() {
       if (getState("docwritepreloadssecond") == "second" && getState("docwritepreloadsthird") == "third") {