Move another block of extension tests to manifest_version 2

chrome/test/data/extensions/api_test/permissions/always_allowed/background.html

-<script>
-// This tests whether we have permission to use individual functions, despite
-// not having asked for any permissions in the manifest.
-
-chrome.test.runTests([
-
-  // Test the tabs API.
-  function tabs() {
-    try {
-      chrome.tabs.create({url: "404_is_enough.html"}, function(tab1) {
-        chrome.tabs.update(tab1.id, {url: "404_again.html"}, function(tab2) {
-          chrome.tabs.onRemoved.addListener(function(tabId, removeInfo) {
-            chrome.test.assertEq(tab1.id, tabId);
-            chrome.test.succeed();
-          });
-          chrome.tabs.remove(tab1.id);
-        });
-      });
-    } catch (e) {
-      chrome.test.fail();
-    }
-  },
-
-  // Negative test for the tabs API.
-  function tabsNegative() {
-    try {
-      var tab = chrome.tabs.getSelected();
-      chrome.test.fail();
-    } catch (e) {
-      chrome.test.succeed();
-    }
-  }
-
-]);
-</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>