Future-ify all the html methods and add named parameters

samples/swarm/DataSource.dart

Index: samples/swarm/DataSource.dart
diff --git a/samples/swarm/DataSource.dart b/samples/swarm/DataSource.dart
index 8831d3be4be5a94fdc84c9e5469a208c9d8b10e3..662e1d55a7d92496fbf2275ca7668d5bc26f069a 100644
--- a/samples/swarm/DataSource.dart
+++ b/samples/swarm/DataSource.dart
@@ -223,7 +223,7 @@ class Article {
     } 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;
     }