Revert r11881. metadata_test fails for yet to be discover reasons.

tests/language/type_parameter_test.dart

-// Copyright (c) 2012, 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.
-
-class A<T extends Hashable> {
-  Function closure;
-  A._(this.closure);
-
-  factory A() {
-    return new A._(() => new Set<T>());
-  }
-
-  A.bar() {
-    closure = () => new Set<T>();
-  }
-
-  static
-  T /// 01: static type warning, dynamic type error
-  staticMethod(
-  T /// 02: static type warning, dynamic type error
-  a) {
-    final
-    T /// 03: static type warning, dynamic type error
-    a = null;
-    print(a);
-  }
-
-  static final
-  T /// 04: static type warning, dynamic type error
-  staticField = null;
-}
-
-main() {
-  var s = ((new A()).closure)();
-  Expect.isTrue(s is Set);
-
-  s = ((new A.bar()).closure)();
-  Expect.isTrue(s is Set);
-
-  s = ((new A<int>()).closure)();
-  Expect.isTrue(s is Set<int>);
-  Expect.isFalse(s is Set<double>);
-
-  s = ((new A<int>.bar()).closure)();
-  Expect.isTrue(s is Set<int>);
-  Expect.isFalse(s is Set<double>);
-
-  A.staticMethod(null);
-  print(A.staticField);
-}