Fixes for the upcoming sdk changes (bleeding_edge 16052)

lib/web_ui.dart

 // Copyright (c) 2012, 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.
 
 /**
  * This library exposes the types in [watcher], [safe_html], [templating] and
  * the [WebComponent] base class. See this article for more information about
  * this library: <http://www.dartlang.org/articles/dart-web-components/>.
  */
 library web_ui;
@@ skipping 289 matching lines @@
   bool hasChildNodes() => _element.hasChildNodes();
 
   Node insertBefore(Node newChild, Node refChild) =>
     _element.insertBefore(newChild, refChild);
 
   Map<String, String> get attributes => _element.attributes;
   set attributes(Map<String, String> value) {
     _element.attributes = value;
   }
 
-  List<Element> get elements => _element.elements;
+  List<Element> get elements => _element.children;
 
   set elements(Collection<Element> value) {
-    _element.elements = value;
+    _element.children = value;
   }
 
   List<Element> get children => _element.children;
 
   set children(Collection<Element> value) {
     _element.children = value;
   }
 
   Set<String> get classes => _element.classes;
 
@@ skipping 11 matching lines @@
 
   Future<CssStyleDeclaration> get computedStyle => _element.computedStyle;
 
   Future<CssStyleDeclaration> getComputedStyle(String pseudoElement)
     => _element.getComputedStyle(pseudoElement);
 
   Element clone(bool deep) => _element.clone(deep);
 
   Element get parent => _element.parent;
 
+  Node get parentNode => _element.parentNode;
+
   ElementEvents get on => _element.on;
 
   String get contentEditable => _element.contentEditable;
 
   String get dir => _element.dir;
 
   bool get draggable => _element.draggable;
 
   bool get hidden => _element.hidden;
 
@@ skipping 213 matching lines @@
 }
 
 /**
  * Set this to true to use native Shadow DOM if it is supported.
  * Note that this will change behavior of [WebComponent] APIs for tree
  * traversal.
  */
 bool useShadowDom = false;
 
 bool get _realShadowRoot => useShadowDom && ShadowRoot.supported;