Make browser tests all run from a server instead of the local filesystem.

samples/tests/samples/swarm/swarm_test.dart

Index: samples/tests/samples/swarm/swarm_test.dart
diff --git a/samples/tests/samples/swarm/swarm_test.dart b/samples/tests/samples/swarm/swarm_test.dart
index ff0c0544e31b6dddc0f496e75676f389954bf12b..df942b789bbd33ad2a4d0715f4f1c816d4eb03fd 100644
--- a/samples/tests/samples/swarm/swarm_test.dart
+++ b/samples/tests/samples/swarm/swarm_test.dart
@@ -18,7 +18,7 @@ import '../../../../pkg/unittest/lib/html_config.dart';
 
 void main() {
   useHtmlConfiguration();
-  Swarm swarm = new Swarm();
+  Swarm swarm = new Swarm(useCannedData: true);
   UIStateProxy state = new UIStateProxy(swarm.sections);
   swarm.state = state;
   swarm.run();
@@ -56,7 +56,7 @@ void main() {
         // transition end event before we can click a story.
         SectionView section = getView(swarm.sections[0]);
         section.showSources();
-      }, 
+      },
       () {
         final item = swarm.sections[0].feeds[2].articles[1];
         state.loadFromHistory(getHistory(item));