Move another block of extension tests to manifest_version 2.

chrome/test/data/extensions/api_test/fileapi/background.html

-<script>
-  var fileSystem = null;
-
-  console.log("Requesting a filesystem...");
-  webkitRequestFileSystem(window.TEMPORARY, 100, getFileSystem, errorCallback);
-
-  function getFileSystem(fs) {
-    fileSystem = fs;
-    console.log("DONE requesting filesystem: " + fileSystem.name);
-    fileSystem.root.getDirectory('dir', {create:true},
-                                 directoryCallback, errorCallback);
-  }
-
-  function directoryCallback(directory) {
-    console.log("DONE creating directory: " + directory.path);
-    directory.getFile('file', {create:true}, fileCallback, errorCallback);
-  }
-
-  function fileCallback(file) {
-    console.log("DONE creating file: " + file.path);
-
-    // See if we get the same filesystem space in the tab.
-    console.log("Opening tab...");
-    chrome.tabs.create({
-      url: "tab.html"
-    });
-  }
-
-  function errorCallback(error) {
-    chrome.test.fail("Got unexpected error: " + error.code);
-  }
-</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.js"></script>