Update dart2js_foreign suite as we now validate annotations.

dart/tests/compiler/dart2js_foreign/native_class_is_check3_test.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.
 
 // Test for correct simple is-checks on hidden native classes.
 
+import 'native_metadata.dart';
+
 interface J {
 }
 
 interface I extends J {
   I read();
   write(I x);
 }
 
 // Native implementation.
 
-@native("*A")
+@Native("*A")
 class A implements I  {
   // The native class accepts only other native instances.
   @native A read();
   @native write(A x);
 }
 
-@native("*B")
+@Native("*B")
 class B extends A  {
 }
 
 @native makeA();
 @native makeB();
 
-@native("""
+@Native("""
 // This code is all inside 'setup' and so not accesible from the global scope.
 function inherits(child, parent) {
   if (child.prototype.__proto__) {
     child.prototype.__proto__ = parent.prototype;
   } else {
     function tmp() {};
     tmp.prototype = parent.prototype;
     child.prototype = new tmp();
     child.prototype.constructor = child;
   }
@@ skipping 29 matching lines @@
   Expect.isTrue(b1 is A);
   Expect.isTrue(b1 is B);
   Expect.isTrue(b1 is !C);
 
   Expect.isTrue(a1 is J);
   Expect.isTrue(a1 is I);
   Expect.isTrue(a1 is A);
   Expect.isTrue(a1 is !B);
   Expect.isTrue(a1 is !C);
 }