Add JSNative utility class with static methods methods to efficiently manipulate typed JSInterop ob…

tests/compiler/dart2js_native/call_on_native_class_test.dart

Index: tests/compiler/dart2js_native/call_on_native_class_test.dart
diff --git a/tests/compiler/dart2js_native/call_on_native_class_test.dart b/tests/compiler/dart2js_native/call_on_native_class_test.dart
deleted file mode 100644
index 51429821bf3d2bfd756c5911feb3c0e0fe549b97..0000000000000000000000000000000000000000
--- a/tests/compiler/dart2js_native/call_on_native_class_test.dart
+++ /dev/null
@@ -1,17 +0,0 @@
-// Copyright (c) 2013, 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.
-
-import 'dart:_js_helper';
-
-@Native('*A')
-class A {
-}
-
-class B extends A {
-  call() => 42;
-}
-
-main() {
-  new B()();
-}