Add @Native(...) annotation for native class names.

tests/compiler/dart2js_native/native_field_invocation5_test.dart

Index: tests/compiler/dart2js_native/native_field_invocation5_test.dart
diff --git a/tests/compiler/dart2js_native/native_field_invocation5_test.dart b/tests/compiler/dart2js_native/native_field_invocation5_test.dart
index 8288344138c484d61c80275c5b3d3785bad390f8..e5a04402808838eac25d02fbaef613df2ddb1f9c 100644
--- a/tests/compiler/dart2js_native/native_field_invocation5_test.dart
+++ b/tests/compiler/dart2js_native/native_field_invocation5_test.dart
@@ -2,6 +2,7 @@
 // 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 "dart:_js_helper";
 import "package:expect/expect.dart";
 
 makeCC() native;
@@ -17,7 +18,8 @@ class C {
   foo(x) => x;
 }
 
-class ClickCounter native "CC" {
+@Native("CC")
+class ClickCounter {
   var status;
 
   var foo;