Fix bug in Directory after porting to using native ports

tests/standalone/src/DirectoryTest.dart

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 //
 // Directory listing test.
 
 #import("dart:io");
 
 class DirectoryTest {
   static void testListing() {
     bool listedDir = false;
     bool listedFile = false;
 
     Directory directory = new Directory("");
     directory.createTempSync();
     Directory subDirectory = new Directory("${directory.path}/subdir");
     Expect.isFalse(subDirectory.existsSync());
     subDirectory.createSync();
     File f = new File('${subDirectory.path}/file.txt');
     Expect.isFalse(f.existsSync());
     f.createSync();
 
     directory.dirHandler = (dir) {
       listedDir = true;
+      Expect.isTrue(dir.contains(directory.path));
       Expect.isTrue(dir.contains('subdir'));
     };
 
     directory.fileHandler = (f) {
       listedFile = true;
+      Expect.isTrue(f.contains(directory.path));
       Expect.isTrue(f.contains('subdir'));
       Expect.isTrue(f.contains('file.txt'));
     };
 
     directory.doneHandler = (completed) {
       Expect.isTrue(completed, "directory listing did not complete");
       Expect.isTrue(listedDir, "directory not found");
       Expect.isTrue(listedFile, "file not found");
       directory.delete(recursive: true);
       directory.deleteHandler = () {
@@ skipping 434 matching lines @@
   dir.createTemp();
 }
 
 
 main() {
   DirectoryTest.testMain();
   NestedTempDirectoryTest.testMain();
   testCreateTempErrorSync();
   testCreateTempError();
 }