Move another set of extension tests to manifest_version 2

chrome/test/data/extensions/api_test/tabs/on_updated/iframeNavigated/iframe2.html

Index: chrome/test/data/extensions/api_test/tabs/on_updated/iframeNavigated/iframe2.html
===================================================================
--- chrome/test/data/extensions/api_test/tabs/on_updated/iframeNavigated/iframe2.html	(revision 112170)
+++ chrome/test/data/extensions/api_test/tabs/on_updated/iframeNavigated/iframe2.html	(working copy)
@@ -1,10 +1,8 @@
+<!--
+ * Copyright (c) 2011 The Chromium Authors. All rights reserved.  Use of this
+ * source code is governed by a BSD-style license that can be found in the
+ * LICENSE file.
+-->
 <h1>iframe2</h1>
 
-<script>
-window.onload = function() {
-  // Navigate after onload so that 'complete' status will fire.
-  setTimeout(function() {
-    location.href = "iframe3.html";
-  }, 0);
-}
-</script>
+<script src="frame2.js"></script>