use .append instead of .nodes.add

tests/html/template_element_test.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.
 
 library template_element_test;
 
 import 'dart:async';
 import 'dart:collection';
 import 'dart:html';
 import 'dart:math' as math;
@@ skipping 10 matching lines @@
 
 main() {
   useHtmlConfiguration();
   group('Template Element', templateElementTests);
 }
 
 templateElementTests() {
   var testDiv;
 
   setUp(() {
-    document.body.nodes.add(testDiv = new DivElement());
+    document.body.append(testDiv = new DivElement());
   });
 
   tearDown(() {
     testDiv.remove();
     testDiv = null;
   });
 
   createTestHtml(s) {
     var div = new DivElement();
     div.innerHtml = s;
-    testDiv.nodes.add(div);
+    testDiv.append(div);
 
     for (var node in div.queryAll('*')) {
       if (node.isTemplate) TemplateElement.decorate(node);
     }
 
     return div;
   }
 
   createShadowTestHtml(s) {
     var div = new DivElement();
     var root = div.createShadowRoot();
     root.innerHtml = s;
-    testDiv.nodes.add(div);
+    testDiv.append(div);
 
     for (var node in root.queryAll('*')) {
       if (node.isTemplate) TemplateElement.decorate(node);
     }
 
     return root;
   }
 
   recursivelySetTemplateModel(element, model) {
     for (var node in element.queryAll('*')) {
@@ skipping 361 matching lines @@
     expect(div.nodes.length, 4);
 
     expect(div.nodes[1].tagName, 'P');
     expect(div.nodes[3].tagName, 'P');
   });
 
   test('DefaultStyles', () {
     var t = new Element.tag('template');
     TemplateElement.decorate(t);
 
-    document.body.nodes.add(t);
+    document.body.append(t);
     expect(t.getComputedStyle().display, 'none');
 
     t.remove();
   });
 
 
   test('Bind', () {
     var div = createTestHtml('<template bind="{{}}">Hi {{ name }}</template>');
     var model = toSymbolMap({'name': 'Leela'});
     recursivelySetTemplateModel(div, model);
@@ skipping 1046 matching lines @@
       result[k] = _deepToSymbol(v);
     });
     return result;
   }
   if (value is Iterable) {
     return value.map(_deepToSymbol).toList();
   }
   return value;
 }