Revert "Example showing alternate async measurement solution"

client/html/src/Element.dart

Index: client/html/src/Element.dart
diff --git a/client/html/src/Element.dart b/client/html/src/Element.dart
index 7236491115dd067adcff143e0ba9b898d5bd1a6b..ea5a3de313e826245c101113a4754df92a1f1ab9 100644
--- a/client/html/src/Element.dart
+++ b/client/html/src/Element.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.
 
@@ -8,6 +8,10 @@ interface ElementList extends List<Element> {
   // TODO(jacobr): add insertAt
 }
 
+class DeferredElementRect {
+  // TODO(jacobr)
+}
+
 interface ElementEvents extends Events {
   EventListenerList get abort();
   EventListenerList get beforeCopy();
@@ -181,14 +185,11 @@ interface Element extends Node /*, common.NodeSelector, common.ElementTraversal
 
   bool matchesSelector([String selectors]);
 
-  /** Only access members when [window.inMeasurementFrame] is true. */
-  ElementRect get rect();
+  Future<ElementRect> get rect();
 
-  /** Only call when [window.inMeasurementFrame] is true. */
-  CSSStyleDeclaration get computedStyle();
+  Future<CSSStyleDeclaration> get computedStyle();
 
-  /** Only call when [window.inMeasurementFrame] is true. */
-  CSSStyleDeclaration getComputedStyle(String pseudoElement);
+  Future<CSSStyleDeclaration> getComputedStyle(String pseudoElement);
 
   ElementEvents get on();