Move another block of extension tests to manifest_version 2.

chrome/test/data/extensions/api_test/lazy_background_page/broadcast_event/background.html

Index: chrome/test/data/extensions/api_test/lazy_background_page/broadcast_event/background.html
===================================================================
--- chrome/test/data/extensions/api_test/lazy_background_page/broadcast_event/background.html	(revision 112170)
+++ chrome/test/data/extensions/api_test/lazy_background_page/broadcast_event/background.html	(working copy)
@@ -1,9 +1,6 @@
-<script>
-chrome.tabs.onUpdated.addListener(function(tabId, changeInfo, tab) {
-  // TODO: look for 'stegosaurus' in the page contents.
-  if (tab.url.search("stegosaurus") > -1)
-    chrome.pageAction.show(tabId);
-  else
-    chrome.pageAction.hide(tabId);
-});
-</script>
+<!--
+ * 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.
+-->
+<script src="background.js"></script>