Fix dartdoc tests.

utils/tests/dartdoc/src/dartdoc_tests.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.
 
 /// Unit tests for doc.
 #library('dartdoc_tests');
 
 #import('../../../dartdoc/dartdoc.dart', prefix: 'dd');
 #import('../../../dartdoc/markdown.dart', prefix: 'md');
 
 // TODO(rnystrom): Better path to unittest.
-#import('../../../../client/testing/unittest/unittest_node.dart');
+#import('../../../../client/testing/unittest/unittest_vm.dart');
 #import('../../../../frog/lang.dart');
-#import('../../../../frog/file_system_node.dart');
+#import('../../../../frog/file_system_vm.dart');
 
 main() {
-  var files = new NodeFileSystem();
+  var files = new VMFileSystem();
   parseOptions('../../frog', [], files);
   initializeWorld(files);
 
   group('countOccurrences', () {
     test('empty text returns 0', () {
       expect(dd.countOccurrences('', 'needle')).equals(0);
     });
 
     test('one occurrence', () {
       expect(dd.countOccurrences('bananarama', 'nara')).equals(1);
@@ skipping 100 matching lines @@
     // where test.dart happens to be invoked from.
     final dummyPath = 'utils/tests/dartdoc/src/dummy.dart';
 
     // TODO(rnystrom): Bail if we couldn't find the test file. The problem is
     // that loading dummy.dart is sensitive to the location that dart was
     // *invoked* from and not relative to *this* file like we'd like. That
     // means these tests only run correctly from one place. Unfortunately,
     // test.py/test.dart runs this from one directory and frog/presubmit.py
     // runs it from another.
     // See Bug 1145.
-    var fileSystem = new NodeFileSystem();
+    var fileSystem = new VMFileSystem();
     if (!fileSystem.fileExists(dummyPath)) {
       print("Can't run dartdoc name reference tests because dummy.dart " +
           "could not be found.");
       return;
     }
 
     var doc = new dd.Dartdoc();
     doc.startFile('someLib/someType.html');
 
     world.processDartScript(dummyPath);
@@ skipping 66 matching lines @@
 
     test('to a named constructor', () {
       expect(render(doc.resolveNameReference('new Class.namedConstructor',
                   library: dummy))).
         equals('<a class="crossref" ' +
             'href="../dummy/Class.html#new:Class.namedConstructor">new ' +
             'Class.namedConstructor</a>');
     });
   });
 }