Make dartdoc and apidoc run on the VM instead of node.

utils/apidoc/apidoc.dart

 // Copyright (c) 2011, 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.
 
 /**
  * Generates the complete set of corelib reference documentation.
  */
 #library('apidoc');
 
 #import('dart:json');
 #import('html_diff.dart');
 #import('../../frog/lang.dart');
-#import('../../frog/file_system_node.dart');
+#import('../../frog/file_system_vm.dart');
 #import('../../frog/file_system.dart');
 #import('../dartdoc/dartdoc.dart', prefix: 'doc');
 
 HtmlDiff _diff;
 
 final GET_PREFIX = 'get:';
 
 void main() {
-  var files = new NodeFileSystem();
-  parseOptions('../../frog', [] /* args */, files);
+  var files = new VMFileSystem();
+  parseOptions('../../frog', ['', '', '--libdir=../../frog/lib'], files);
   initializeWorld(files);
 
   print('Parsing MDN data...');
   final mdn = JSON.parse(files.readAll('mdn/database.json'));
 
   print('Cross-referencing dart:dom and dart:html...');
   HtmlDiff.initialize();
   _diff = new HtmlDiff();
   _diff.run();
   world.reset();
@@ skipping 349 matching lines @@
       return
           '''
           <p class="correspond">This corresponds to $domTypesText in the
           ${a("dom.html", "dart:dom")} library.</p>
           ''';
     }
 
     return '';
   }
 }