Move another block of extension tests to manifest_version 2.

chrome/test/data/extensions/api_test/events/background.html

-<script>
-chrome.test.runTests([
-  // Tests that attaching and detaching to an event for which we don't have
-  // permission acts as expected (e.g. we don't DCHECK!).
-  function attachAndDetachNoPermisssions() {
-    function dummy() {};
-    try {
-      chrome.tabs.onUpdated.addListener(dummy);
-      chrome.test.fail();
-    } catch (e) {
-      chrome.test.assertTrue(
-          e.message.search("You do not have permission") >= 0,
-          e.message);
-    }
-    chrome.test.assertFalse(chrome.tabs.onUpdated.hasListeners());
-    chrome.tabs.onUpdated.removeListener(dummy);  // browser should not DCHECK
-    chrome.test.succeed();
-  },
-
-  // Tests that attaching a named event twice will fail.
-  function doubleAttach() {
-    function dummy() {};
-    var onClicked = new chrome.Event("browserAction.onClicked");
-    var onClicked2 = new chrome.Event("browserAction.onClicked");
-    onClicked.addListener(dummy);
-    chrome.test.assertTrue(onClicked.hasListeners());
-    try {
-      onClicked2.addListener(dummy);
-      chrome.test.fail();
-    } catch (e) {
-      chrome.test.assertTrue(
-          e.message.search("already attached") >= 0,
-          e.message);
-    }
-    chrome.test.assertFalse(onClicked2.hasListeners());
-    onClicked2.removeListener(dummy);
-
-    onClicked.removeListener(dummy);
-    chrome.test.assertFalse(onClicked.hasListeners());
-    chrome.test.succeed();
-  },
-
-  // Tests that 2 pages attaching to the same event does not trigger a DCHECK.
-  function twoPageAttach() {
-    // Test harness should already have opened tab.html, which registers this
-    // listener.
-    chrome.browserAction.onClicked.addListener(function() {});
-
-    // Test continues in twoPageAttach.html.
-    window.open("twoPageAttach.html");
-  },
-]);
-</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>