Remove LibraryMirror.topLevelMembers.

tests/lib/mirrors/immutable_collections_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.immutable_collections;
 
 import 'dart:mirrors';
 import 'package:expect/expect.dart';
 
 someException(e) => e is Exception || e is Error;
@@ skipping 51 matching lines @@
 checkDeclaration(DeclarationMirror dm) {
   if (dm is MethodMirror) checkMethod(dm);
   if (dm is ClassMirror) checkClass(dm);
   if (dm is TypeMirror) checkType(dm);
   if (dm is VariableMirror) checkVariable(dm);
   if (dm is TypeVariableMirror) checkTypeVariable(dm);
 }
 
 checkLibrary(LibraryMirror lm) {
   checkMap(lm.declarations, 'LibraryMirror.declarations');
-  checkMap(lm.topLevelMembers, 'LibraryMirror.topLevelMembers');
   checkList(lm.metadata, 'LibraryMirror.metadata');
 
   lm.declarations.values.forEach(checkDeclaration);
-  lm.topLevelMembers.values.forEach(checkDeclaration);
 }
 
 main() {
   currentMirrorSystem().libraries.values.forEach(checkLibrary);
   checkType(currentMirrorSystem().voidType);
   checkType(currentMirrorSystem().dynamicType);
 }