Revert "Fix null.runtimeType, reflect(null).type.superinterfaces, and reflect(null).getField."

tests/lib/mirrors/null_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.
 
 library test.null_test;
 
 import 'dart:mirrors';
 
 import 'package:expect/expect.dart';
 
@@ skipping 10 matching lines @@
                  .reflectee);
   Expect.equals('null',
                 nullMirror.invoke(#toString, []).reflectee);
   Expect.throws(() => nullMirror.invoke(#notDefined, []),
                 (e) => e is NoSuchMethodError,
                 'noSuchMethod');
 
   ClassMirror NullMirror = nullMirror.type;
   Expect.equals(reflectClass(Null), NullMirror);
   Expect.equals(#Null, NullMirror.simpleName);
-  Expect.equals(#Object, NullMirror.superclass.simpleName);  /// 00: ok
-  Expect.equals(null, NullMirror.superclass.superclass);  /// 00: continued
+  Expect.equals(#Object, NullMirror.superclass.simpleName);
+  Expect.equals(null, NullMirror.superclass.superclass);
   Expect.listEquals([], NullMirror.superinterfaces);
   Expect.equals(currentMirrorSystem().libraries[Uri.parse('dart:core')],
                 NullMirror.owner);
 }