Added back childNodes and getAttribute and setAttribute.

samples/third_party/dromaeo/tests/dom-traverse-html.dart

Index: samples/third_party/dromaeo/tests/dom-traverse-html.dart
diff --git a/samples/third_party/dromaeo/tests/dom-traverse-html.dart b/samples/third_party/dromaeo/tests/dom-traverse-html.dart
index d49e9d98ed4b0e058854216bc32b917e0a2cf298..19fb3e5e9077b86c74725c808483454f8bd47343 100644
--- a/samples/third_party/dromaeo/tests/dom-traverse-html.dart
+++ b/samples/third_party/dromaeo/tests/dom-traverse-html.dart
@@ -34,7 +34,7 @@ void main() {
       document.body.append(div);
     })
     .test('firstChild', () {
-      final nodes = document.body.nodes;
+      final nodes = document.body.childNodes;
       final nl = nodes.length;
 
       for (int i = 0; i < num; i++) {
@@ -48,7 +48,7 @@ void main() {
       }
     })
     .test('lastChild', () {
-      final nodes = document.body.nodes;
+      final nodes = document.body.childNodes;
       final nl = nodes.length;
 
       for (int i = 0; i < num; i++) {
@@ -81,7 +81,7 @@ void main() {
     })
     .test('childNodes', () {
       for (int i = 0; i < num; i++) {
-        final nodes = document.body.nodes;
+        final nodes = document.body.childNodes;
         for (int j = 0; j < nodes.length; j++) {
           ret = nodes[j];
         }