Fix issue 2358: dart methods on native classes must also check if the current prototype has the met…

frog/tests/native/src/NativeClassInheritance4FrogTest.dart

 // Copyright (c) 2011, 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.
 
 // Additional Dart code may be 'placed on' hidden native classes.  With
 // inheritance, the superclass method must not be reached by a call on the
 // subclass.
 
 class A native "*A" {
   var _field;
@@ skipping 101 matching lines @@
   Expect.equals(1, b._field);
   Expect.equals(123, b._field2);
   Expect.equals(123, b.X);
   Expect.equals(200, b.method(77));
 }
 
 testAB_typed() {
   setup();  // Fresh constructors.
 
   A a = makeA();
-  B b = makeA();
+  B b = makeB();
 
   a.X = 100;
   Expect.equals(100, a._field);
   Expect.equals(100, a.X);
   Expect.equals(150, a.method(50));
 
   b._field = 1;
   b._field2 = 2;
   b.X = 123;
   Expect.equals(1, b._field);
   Expect.equals(123, b._field2);
   Expect.equals(123, b.X);
   Expect.equals(200, b.method(77));
 }
 
 main() {
   testBasicA_dynamic();
   testBasicA_typed();
   testBasicB_dynamic();
   testBasicB_typed();
   testAB_dynamic();
   testAB_typed();
 }