Fix glob list on Windows.

pkg/glob/test/list_test.dart

 // Copyright (c) 2014, 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.
 
 import 'dart:async';
 import 'dart:io';
 
 import 'package:glob/glob.dart';
 import 'package:glob/src/utils.dart';
 import 'package:path/path.dart' as p;
@@ skipping 247 matching lines @@
     {bool recursive, bool followLinks});
 
 /// Runs [callback] in two groups with two values of [listFn]: one that uses
 /// [Glob.list], one that uses [Glob.listSync].
 void syncAndAsync(callback(ListFn listFn)) {
   group("async", () {
     callback((glob, {recursive: false, followLinks: true}) {
       return schedule(() {
         return new Glob(glob, recursive: recursive)
             .list(root: sandbox, followLinks: followLinks)
-            .map((entity) {
-          return separatorToForwardSlash(
-              p.relative(entity.path, from: sandbox));
-        }).toList();
+            .map((entity) => p.relative(entity.path, from: sandbox))
+            .toList();
       }, 'listing $glob');
     });
   });
 
   group("sync", () {
     callback((glob, {recursive: false, followLinks: true}) {
       return schedule(() {
         return new Glob(glob, recursive: recursive)
             .listSync(root: sandbox, followLinks: followLinks)
-            .map((entity) {
-          return separatorToForwardSlash(
-              p.relative(entity.path, from: sandbox));
-        }).toList();
+            .map((entity) => p.relative(entity.path, from: sandbox))
+            .toList();
       }, 'listing $glob');
     });
   });
 }
 
 void scheduleSandbox() {
   schedule(() {
     return Directory.systemTemp.createTemp('glob_').then((dir) {
       sandbox = dir.path;
       d.defaultRoot = sandbox;
     });
   }, 'creating sandbox');
 
   currentSchedule.onComplete.schedule(() {
     d.defaultRoot = null;
     if (sandbox == null) return null;
     var oldSandbox = sandbox;
     sandbox = null;
     return new Directory(oldSandbox).delete(recursive: true);
   });
 }