Fix html/js_type_test for Dartium

tests/html/js_type_test_lib.dart

Index: tests/html/js_type_test_lib.dart
diff --git a/tests/language/regress_25609_test.dart b/tests/html/js_type_test_lib.dart
similarity index 67%
copy from tests/language/regress_25609_test.dart
copy to tests/html/js_type_test_lib.dart
index 579f1c2b34d925c5e6ee74dd1fce9458997bc035..6b7113c42edbdc4097826c854eab5e3db9222494 100644
--- a/tests/language/regress_25609_test.dart
+++ b/tests/html/js_type_test_lib.dart
@@ -2,12 +2,12 @@
 // 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.
 
-// VMOptions=--error-on-bad-type
+@JS()
+library js_type_test_lib;
 
-import 'regress_25609_lib1.dart';
+import 'package:js/js.dart';
 
-Foo baz() => null;
-
-main () {
-  baz();
+@JS()
+class Foo {
+  external factory Foo();
 }