Move another bunch of extension API tests to manifest_version 2.

chrome/test/data/extensions/api_test/content_scripts/about_blank_iframes/test.html

-<script>
-chrome.test.getConfig(function(config) {
-  chrome.test.runTests([
-    function onRequest() {
-      chrome.extension.onRequest.addListener(
-        function(request, sender, sendResponse) {
-          if (request == "parent")
-            chrome.test.succeed();
-          else
-            chrome.test.fail("Unexpected request: " + JSON.stringify(request));
-        }
-      );
-      chrome.test.log("Creating tab...");
-      var test_url =
-          ("http://localhost:PORT/files/extensions/" +
-           "test_file_with_about_blank_iframe.html")
-              .replace(/PORT/, config.testServer.port);
-      chrome.tabs.create({ url: test_url });
-    }
-  ]);
-});
-</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="test.js"></script>