Running entered & left view events in Dartium

tests/html/custom/entered_left_view_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 entered_left_view_test;
 
 import 'dart:async';
 import 'dart:html';
 import 'dart:js' as js;
 import 'package:unittest/html_individual_config.dart';
@@ skipping 44 matching lines @@
     return loadPolyfills().then((_) {
       if (registeredTypes) {
         return;
       }
       registeredTypes = true;
       document.register('x-a', Foo);
     });
   });
 
   group('standard_events', () {
-    var a = new Element.tag('x-a');
+    var a;
     setUp(() {
       invocations = [];
     });
 
     test('Created', () {
       a = new Element.tag('x-a');
       expect(invocations, ['created']);
     });
 
     test('entered', () {
@@ skipping 22 matching lines @@
     });
 
     test('nested leaving triggers left', () {
       div.remove();
       customElementsTakeRecords();
       expect(invocations, ['left']);
     });
   });
 
   group('viewless_document', () {
-    var a = docB.createElement('x-a');
+    var a;
     setUp(() {
       invocations = [];
     });
 
     test('Created, owned by a document without a view', () {
       a = docB.createElement('x-a');
       expect(a.document, docB,
           reason:'new instance should be owned by the document the definition '
           'was registered with');
       expect(invocations, ['created'],
@@ skipping 118 matching lines @@
       Platform.upgradeCustomElements(div);
       invocations = [];
       document.body.append(div);
       customElementsTakeRecords();
       expect(invocations, ['entered'],
           reason: 'the entered callback should be invoked when inserted into a '
           'document with a view as part of a subtree');
     });
   });
 }