Future-ify all the html methods and add named parameters

samples/swarm/DataSource.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.
 
 part of swarmlib;
 
 /** The top-level collection of all sections for a user. */
 // TODO(jimhug): This is known as UserData in the server model.
 class Sections extends Collection<Section> {
   final List<Section> _sections;
@@ skipping 205 matching lines @@
   //   add support for preloading.
   void _ensureLoaded() {
     if (_htmlBody != null) return;
 
     var name = '$dataUri.html';
     if (Sections.runningFromFile) {
       _htmlBody = CannedData.data[name];
     } else {
       // TODO(jimhug): Remove this truly evil synchronoush xhr.
       final req = new HttpRequest();
-      req.open('GET', 'data/$name', false);
+      req.open('GET', 'data/$name', async: false);
       req.send();
       _htmlBody = req.responseText;
     }
   }
 
   static Article decodeHeader(Feed source, Decoder decoder) {
     final id = decoder.readString();
     final title = decoder.readString();
     final srcUrl = decoder.readString();
     final hasThumbnail = decoder.readBool();
     final author = decoder.readString();
     final dateInSeconds = decoder.readInt();
     final snippet = decoder.readString();
     final date =
         new DateTime.fromMillisecondsSinceEpoch(dateInSeconds*1000, isUtc: true);
     return new Article(source, id, date, title, author, srcUrl, hasThumbnail,
         snippet);
   }
 }