Move another bunch of extension API tests to manifest_version 2.

chrome/test/data/extensions/api_test/content_scripts/extension_iframe/test.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.
+
+chrome.test.runTests([
+  // Tests receiving a request from a content script and responding.
+  function onRequest() {
+    chrome.extension.onRequest.addListener(
+      function(request, sender, sendResponse) {
+        chrome.test.assertTrue(request.success);
+        chrome.test.succeed();
+      }
+    );
+  }
+]);
+
+chrome.test.getConfig(function(config) {
+  chrome.test.log("Creating tab...");
+
+  var test_url = "http://localhost:PORT/files/extensions/test_file.html"
+      .replace(/PORT/, config.testServer.port);
+
+  chrome.tabs.create({ url: test_url });
+});