update elements and fix some bugs

test/iron_input_test.dart

 // Copyright (c) 2015, 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.
 @TestOn('browser')
 library polymer_elements.test.iron_input_test;
 
 import 'dart:async';
 import 'dart:html';
 import 'dart:js';
+import 'package:polymer/polymer.dart';
 import 'package:polymer_elements/iron_input.dart';
 import 'package:test/test.dart';
 import 'package:web_components/web_components.dart';
 import 'common.dart';
 
 main() async {
-  await initWebComponents();
+  await initPolymer();
+  var x = 'hello';
 
   group('basic', () {
     test('setting bindValue sets value', () {
       IronInput input = fixture('basic');
       input.bindValue = 'foobar';
       expect(input.value, input.bindValue, reason: 'value equals to bindValue');
     });
 
     test('changing the input triggers an event', () {
       var done = new Completer();
@@ skipping 13 matching lines @@
       IronInput input = fixture('has-value');
       expect(input.bindValue, input.value, reason: 'bindValue equals value');
     });
 
     test('default bindValue sets value', () {
       IronInput input = fixture('has-bind-value');
       expect(input.value, input.bindValue, reason: 'value equals to bindValue');
     });
 
     test('set bindValue to undefined', () {
-      var scope = new JsObject.fromBrowserObject(
-          document.getElementById('bind-to-object'));
+      DomBind scope = document.getElementById('bind-to-object');
       scope['foo'] = null;
-      expect(scope[r'$']['input'].bindValue, isNull,
+      expect(scope.$['input'].bindValue, isNull,
           reason: 'bindValue is falsy');
-      expect(scope[r'$']['input'].value, isEmpty, reason: 'value is falsy');
+      expect(scope.$['input'].value, isEmpty, reason: 'value is falsy');
     });
 
     test('validator used instead of constraints api if provided', () {
       IronInput input = fixture('has-validator')[1];
       input.value = '123';
       input.validate();
       expect(input.invalid, isTrue, reason: 'input is invalid');
     });
 
     test('prevent invalid input works in _onInput', () {
       IronInput input = fixture('prevent-invalid-input');
       input.value = '123';
       input.jsElement.callMethod('_onInput');
       expect(input.bindValue, '123');
       input.value = '123foo';
       input.jsElement.callMethod('_onInput');
       expect(input.bindValue, '123');
     });
   });
 }