Move another block of extension tests to manifest_version 2.

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

Index: chrome/test/data/extensions/api_test/lazy_background_page/browser_action_with_callback/background.html
===================================================================
--- chrome/test/data/extensions/api_test/lazy_background_page/browser_action_with_callback/background.html	(revision 112170)
+++ chrome/test/data/extensions/api_test/lazy_background_page/browser_action_with_callback/background.html	(working copy)
@@ -1,15 +1,6 @@
-<script>
-chrome.browserAction.onClicked.addListener(function(tab) {
-  // Look for an existing tab for the extensions page before opening a new one.
-  chrome.tabs.getAllInWindow(null, function(tabs) {
-    var chromeExtUrl = "chrome://extensions/";
-    for (var i = 0; i < tabs.length; i++) {
-      if (tabs[i].url == chromeExtUrl){
-        chrome.tabs.update(tabs[i].id, {selected: true});
-        return;
-      }
-    }
-    chrome.tabs.create({url: chromeExtUrl, selected: true});
-  });
-});
-</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>