Revert "Example showing alternate async measurement solution"

client/tests/client/samples/swarm/swarm_tests.dart

Index: client/tests/client/samples/swarm/swarm_tests.dart
diff --git a/client/tests/client/samples/swarm/swarm_tests.dart b/client/tests/client/samples/swarm/swarm_tests.dart
index 1d0b5e5c2706af351360916f018c62de9e8b7c87..017da3617606a6851c07bdad518614d13c71aa3a 100644
--- a/client/tests/client/samples/swarm/swarm_tests.dart
+++ b/client/tests/client/samples/swarm/swarm_tests.dart
@@ -1,4 +1,4 @@
-// Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
+// 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.
 
@@ -75,9 +75,9 @@ void main() {
 
     Expect.isTrue(getStoryNode().classes.contains(CSS.HIDDEN_STORY));
 
-    final DataSourceView dataSourceView =
+    final dataSourceView =
         swarm.frontView.currentSection.dataSourceView.getSubview(0);
-    var itemView = dataSourceView.itemsView.getSubview(0);
+    final itemView = dataSourceView.itemsView.getSubview(0);
     // TODO(jacobr): remove  this null check. This is likely due to tests
     // running without the correct CSS to size the window so that some items
     // are visible.