Fix owner of mixin forwarding constructors

tests/language/regress_25246_1_test.dart

Index: tests/language/regress_25246_1_test.dart
diff --git a/tools/canary.dart b/tests/language/regress_25246_1_test.dart
similarity index 67%
copy from tools/canary.dart
copy to tests/language/regress_25246_1_test.dart
index 0df9f70422ccd1cb0f5469da854a074693bef64c..e392e893f51531bbd35ca0eaf25cb39712cba64d 100644
--- a/tools/canary.dart
+++ b/tests/language/regress_25246_1_test.dart
@@ -2,6 +2,10 @@
 // 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.
 
+import 'regress_25246_2.dart';
+
+class ConcreteClass extends Object with MixIn { }
+
 void main() {
-  print("Success running the canary.");
+  new ConcreteClass().test();
 }