Implement reflecting on static fields.

dart/tests/lib/mirrors/inherit_field_test.dart

 // 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.
 
-// Test abstract classes are retained.
+// Test inherited fields.
 
-library test.abstract_test;
+library test.inherit_field_test;
 
 import 'dart:mirrors';
 
 import 'stringify.dart';
 
-abstract class Foo {
+class Foo {
+  var field;
+}
+
+class Bar extends Foo {
 }
 
 void main() {
-  expect('Class(s(Foo) in s(test.abstract_test), top-level)',
-         reflectClass(Foo));
+  expect('Variable(s(field) in s(Foo))',
+         reflectClass(Foo).members[new Symbol('field')]);
+  expect('<null>',
+         reflectClass(Bar).members[new Symbol('field')]);
 }