Move another bunch of extension API tests to manifest_version 2.

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

+// 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.
+
+// 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"});