Move another bunch of extension API tests to manifest_version 2.

chrome/test/data/extensions/api_test/cross_origin_xhr/file_access/test.html

-<script>
-chrome.test.getConfig(function(config) {
-  chrome.test.runTests([
-    function fileAccessAllowed() {
-      var req = new XMLHttpRequest();
-
-      var url = config.testDataDirectory + "/../test_file.txt";
-      chrome.test.log("Requesting url: " + url);
-      req.open("GET", url, true);
-
-      req.onload = function() {
-        chrome.test.assertEq("Hello!", req.responseText);
-        chrome.test.runNextTest();
-      }
-      req.onerror = function() {
-        chrome.test.log("status: " + req.status);
-        chrome.test.log("text: " + req.responseText);
-        chrome.test.fail("Unexpected error for url: " + url);
-      }
-
-      req.send(null);
-    }
-  ]);
-});
-</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>