Fixes for the upcoming sdk changes (bleeding_edge 16052)

lib/web_ui.dart

Index: lib/web_ui.dart
diff --git a/lib/web_ui.dart b/lib/web_ui.dart
index 2bc6f95ce1ae09ec00bb2155d985b863a70a39b3..627a66d78f619258e5e6f9e19361298b1023b037 100644
--- a/lib/web_ui.dart
+++ b/lib/web_ui.dart
@@ -307,10 +307,10 @@ abstract class WebComponent implements Element {
     _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;
@@ -342,6 +342,8 @@ abstract class WebComponent implements Element {
 
   Element get parent => _element.parent;
 
+  Node get parentNode => _element.parentNode;
+
   ElementEvents get on => _element.on;
 
   String get contentEditable => _element.contentEditable;