Some use of the new @static-clean and /// annotations in shared tests

tests/language/src/InstanceFieldNegativeTest.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.
-
-// Dart test to check that we correctly flag the use of an
-// instance field from a static method.
-
-
-class Goofy {
-  String instField;
-  static String bark() {
-    return instField;  // Should get error here.
-  }
-}
-
-class InstanceFieldNegativeTest {
-  static testMain() {
-    var s = Goofy.bark();
-  }
-}
-
-
-main() {
-  InstanceFieldNegativeTest.testMain();
-}