Move another bunch of extension API tests to manifest_version 2.

chrome/test/data/extensions/api_test/cookies/api/background.html

-<script>
-  // Ensure we started with an empty profile.
-  chrome.test.assertEq(document.cookie, "");
-
-  // Set some cookies with a few different modifiers.
-  var expire = new Date();
-  expire.setDate(expire.getDate() + 1);  // tomorrow
-  document.cookie = "a=1";
-  document.cookie = "b=2; path=/; domain=" + location.host;
-  document.cookie = "c=3; path=/; expires=" + expire +
-                    "; domain=" + location.host;
-
-  // Open a tab. This doesn't really prove we're writing to disk, but it is
-  // difficult to prove that without shutting down the process.
-  chrome.tabs.create({url: "tab.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.html"></script>