Move another block of extension tests to manifest_version 2.

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

-<script>
-var fileSystem = null;
-
-function errorCallback(error) {
-  chrome.test.fail("Got unexpected error: " + error.code);
-}
-
-function successCallback(entry) {
-  chrome.test.succeed();
-}
-
-function successEntryCallback(entry) {
-  fileSystem.root.getDirectory('dir', {create:false},
-      function(directory) {
-        // Do clean-up.  (Assume the tab won't be reloaded in testing.)
-        directory.removeRecursively(successCallback, errorCallback);
-      }, errorCallback);
-}
-
-chrome.test.runTests([function tab() {
-  console.log("Requesting a filesystem...");
-  webkitRequestFileSystem(window.TEMPORARY, 100, function(fs) {
-    fileSystem = fs;
-    // See if we get the same filesystem image.
-    console.log("DONE requesting filesystem: " + fileSystem.name);
-    fileSystem.root.getFile('dir/file', {create:false},
-                            successEntryCallback, errorCallback);
-  }, errorCallback);
-}]);
-</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="tab.js"></script>