Implement topLevelMembers, staticMembers, instanceMembers in the VM.

tests/lib/mirrors/toplevel_members_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.toplevel_members;
 
 import 'dart:mirrors';
 import 'package:expect/expect.dart';
 
 import 'stringify.dart';
 import 'declarations_model.dart' as declarations_model;
 
 selectKeys(map, predicate) {
   return map.keys.where((key) => predicate(map[key]));
 }
 
 main() {
   LibraryMirror lm =
       currentMirrorSystem().findLibrary(#test.declarations_model);
 
   Expect.setEquals(
     [#libraryVariable,
      const Symbol('libraryVariable='),
      #libraryGetter,
      const Symbol('librarySetter='),
      #libraryMethod,
-     #_libraryVariable,
-     const Symbol('_libraryVariable='),
-     #_libraryGetter,
-     const Symbol('_librarySetter='),
-     #_libraryMethod,
+     MirrorSystem.getSymbol('_libraryVariable', lm),
+     MirrorSystem.getSymbol('_libraryVariable=', lm),
+     MirrorSystem.getSymbol('_libraryGetter', lm),
+     MirrorSystem.getSymbol('_librarySetter=', lm),
+     MirrorSystem.getSymbol('_libraryMethod', lm),
      #Predicate,
      #Superclass,
      #Interface,
      #Mixin,
-     #_PrivateClass,
+     #Class,
+     MirrorSystem.getSymbol('_PrivateClass', lm),
      #ConcreteClass],
     selectKeys(lm.topLevelMembers, (dm) => true));
 
   Expect.setEquals(
     [#libraryVariable,
      const Symbol('libraryVariable='),
-     #_libraryVariable,
-     const Symbol('_libraryVariable='),
+     MirrorSystem.getSymbol('_libraryVariable', lm),
+     MirrorSystem.getSymbol('_libraryVariable=', lm),
      #Predicate,
      #Superclass,
      #Interface,
      #Mixin,
-     #_PrivateClass,
+     #Class,
+     MirrorSystem.getSymbol('_PrivateClass', lm),
      #ConcreteClass],
     selectKeys(lm.topLevelMembers, (dm) => dm.isSynthetic));
 }