Fix html/js test on Dartium.

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;
@@ skipping 277 matching lines @@
       context['obj'] = obj;
       expect(context['obj'], same(obj));
       context.deleteProperty('obj');
     });
 
     group('caching', () {
       test('JS->Dart', () {
         // Test that we are not pulling cached proxy from the prototype
         // when asking for a proxy for the object.
         final proto = context['someProto'];
-        expect(proto['role'], same('proto'));
+        expect(proto['role'], equals('proto'));
         final obj = context['someObject'];
-        expect(obj['role'], same('object'));
+        expect(obj['role'], equals('object'));
       });
     });
 
   });
 
   group('context', () {
 
     test('read global field', () {
       expect(context['x'], equals(42));
       expect(context['y'], isNull);
@@ skipping 694 matching lines @@
           // expect(context.callMethod('isPropertyInstanceOf', ['o', listType]),
           //    isTrue);
           context.deleteProperty('o');
         }
       });
 
     });
   });
 
 }