Preserve identity of Dart wrappers on DOM objects

tests/html/js_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 jsTest;
 
 import 'dart:async';
 import 'dart:html';
 import 'dart:typed_data' show ByteBuffer, Int32List;
 import 'dart:indexed_db' show IdbFactory, KeyRange;
 import 'dart:js';
 
 import 'package:unittest/unittest.dart';
-import 'package:unittest/html_config.dart';
+import 'package:unittest/html_individual_config.dart';
 
 _injectJs() {
   final script = new ScriptElement();
   script.type = 'text/javascript';
   script.innerHtml = r"""
 var x = 42;
 
 var _x = 123;
 
 var myArray = ["value1"];
@@ skipping 198 matching lines @@
 }
 
 class TestDartObject {}
 
 class Callable {
   call() => 'called';
 }
 
 main() {
   _injectJs();
-  useHtmlConfiguration();
+  useHtmlIndividualConfiguration();
 
   group('identity', () {
 
     test('context instances should be identical', () {
       var c1 = context;
       var c2 = context;
       expect(identical(c1, c2), isTrue);
     });
 
   /*
@@ skipping 301 matching lines @@
     test('length', () {
       var array = new JsArray.from([1, 2, 3]);
       expect(array.length, 3);
       array.add(4);
       expect(array.length, 4);
       array.length = 2;
       expect(array, [1, 2]);
       array.length = 3;
       expect(array, [1, 2, null]);
     });
- 
+
      test('add', () {
       var array = new JsArray();
       array.add('a');
       expect(array, ['a']);
       array.add('b');
       expect(array, ['a', 'b']);
     });
 
     test('addAll', () {
       var array = new JsArray();
@@ skipping 439 matching lines @@
           // expect(context.callMethod('isPropertyInstanceOf', ['o', listType]),
           //    isTrue);
           context.deleteProperty('o');
         }
       });
 
     });
   });
 
 }