Fix polymer_expressions syntax test on Safari and IE

pkg/polymer_expressions/test/syntax_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.
 
 import 'dart:async';
 import 'dart:html';
 
 import 'package:polymer_expressions/polymer_expressions.dart';
 import 'package:unittest/unittest.dart';
 import 'package:unittest/html_enhanced_config.dart';
 import 'package:observe/observe.dart';
 import 'package:mdv/mdv.dart' as mdv;
 
 main() {
   mdv.initialize();
   useHtmlEnhancedConfiguration();
 
   group('PolymerExpressions', () {
     var testDiv;
 
     setUp(() {
       document.body.append(testDiv = new DivElement());
     });
 
     tearDown(() {
-      testDiv.remove();
+      testDiv.nodes[0].remove();

[Jennifer Messerly, 2013/09/18 07:30:06]

firstChild?

[justinfagnani, 2013/09/18 17:24:15]

Done.

       testDiv = null;
     });
 
     test('should make two-way bindings to inputs', () {
       testDiv.nodes.add(new Element.html('''
           <template id="test" bind>
             <input id="input" value="{{ firstName }}">
           </template>'''));
       var person = new Person('John', 'Messerly', ['A', 'B', 'C']);
       query('#test')
@@ skipping 59 matching lines @@
   List<String> get items => _items;
 
   void set items(List<String> value) {
     _items = value;
     notifyChange(new PropertyChangeRecord(_ITEMS));
   }
 
   String toString() => "Person(firstName: $_firstName, lastName: $_lastName)";
 
 }