Adjust CustomElement as properties again.

pkg/custom_element/lib/custom_element.dart

 // Copyright (c) 2013, 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.
 
 /**
  * Custom Elements let authors define their own elements. Authors associate code
  * with custom tag names, and then use those custom tag names as they would any
  * standard tag. See <www.polymer-project.org/platform/custom-elements.html>
  * for more information.
  */
@@ skipping 179 matching lines @@
       host.createInstance(model, delegate);
   createBinding(String name, model, String path) =>
       host.createBinding(name, model, path);
   bind(String name, model, String path) => host.bind(name, model, path);
   void unbind(String name) => host.unbind(name);
   void unbindAll() => host.unbindAll();
   get bindings => host.bindings;
   BindingDelegate get bindingDelegate => host.bindingDelegate;
   set bindingDelegate(BindingDelegate value) { host.bindingDelegate = value; }
 
+  // TODO(efortuna): Update these when we decide what to do with these
+  // properties.
+  @deprecated
+  String getAttribute(String name) =>
+      host.getAttribute(name);
+
+  @deprecated
+  String getAttributeNS(String namespaceUri, String localName) =>
+      host.getAttributeNS(namespaceUri, localName);
+
+  @deprecated
+  String setAttributeNS(
+      String namespaceUri, String localName, String value) {
+    host.setAttributeNS(namespaceUri, localName, value);
+  }
+
+  @deprecated
+  void setAttribute(String name, String value) =>
+      host.setAttribute(name, value);
+
+  @deprecated
+  List<Node> get childNodes => host.childNodes;
+
   // TODO(jmesserly): this forwarding is temporary until Dart supports
   // subclassing Elements.
   // TODO(jmesserly): we were missing the setter for title, are other things
   // missing setters?
 
   List<Node> get nodes => host.nodes;
 
   set nodes(Iterable<Node> value) { host.nodes = value; }
 
   /**
@@ skipping 399 matching lines @@
       for (var removed in record.removedNodes) {
         if (identical(node, removed)) {
           observer.disconnect();
           element.removed();
           return;
         }
       }
     }
   }).observe(element.parentNode, childList: true);
 }