Bug 661784 - Make sure that the nsITimer variable doesn't get garbage collected causing the updater tests to fail intermittently; r=ehsan

toolkit/mozapps/update/test/chrome/update.sjs

@@ -20,6 +20,7 @@ const URL_UPDATE = URL_HOST + URL_PATH + "update.sjs";
 const SERVICE_URL = URL_HOST + URL_PATH + FILE_SIMPLE_MAR;
 
 const SLOW_MAR_DOWNLOAD_INTERVAL = 100;
+var gTimer;
 
 function handleRequest(aRequest, aResponse) {
   var params = { };
@@ -53,9 +54,9 @@ function handleRequest(aRequest, aResponse) {
     for(var i = 0; i < pathParts.length; ++i)
       marFile.append(pathParts[i]);
     var contents = readFileBytes(marFile);
-    var timer = AUS_Cc["@mozilla.org/timer;1"].
-                createInstance(AUS_Ci.nsITimer);
-    timer.initWithCallback(function(aTimer) {
+    gTimer = AUS_Cc["@mozilla.org/timer;1"].
+             createInstance(AUS_Ci.nsITimer);
+    gTimer.initWithCallback(function(aTimer) {
       aResponse.write(contents);
       aResponse.finish();
     }, SLOW_MAR_DOWNLOAD_INTERVAL, AUS_Ci.nsITimer.TYPE_ONE_SHOT);