Remove the Path class from dart:io

pkg/http_server/test/virtual_directory_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.
 
 import 'dart:async';
 import 'dart:io';
 
+import "package:http_server/http_server.dart";
+import "package:path/path.dart";
 import "package:unittest/unittest.dart";
-import "package:http_server/http_server.dart";
 
 import 'utils.dart';
 
 
 void main() {
   group('serve-root', () {
     test('dir-exists', () {
       expect(HttpServer.bind('localhost', 0).then((server) {
         var dir = new Directory('').createTempSync();
         var virDir = new VirtualDirectory(dir.path);
@@ skipping 269 matching lines @@
                   .whenComplete(() {
                     server.close();
                     dir.deleteSync(recursive: true);
                   });
             }), completion(equals(HttpStatus.NOT_FOUND)));
           });
 
           test('relative-parent-link', () {
             expect(HttpServer.bind('localhost', 0).then((server) {
               var dir = new Directory('').createTempSync();
-              var name = new Path(dir.path).filename;
+              var name = basename(dir.path);
               var file = new File('${dir.path}/file')..createSync();
               var link = new Link('${dir.path}/dir3')
                   ..createSync('../$name/file');
               var virDir = new VirtualDirectory(dir.path);
               virDir.followLinks = true;
 
               virDir.serve(server);
 
               return new HttpClient().get('localhost',
                                           server.port,
@@ skipping 290 matching lines @@
     }
     testEncoding('..', HttpStatus.NOT_FOUND, false);
     testEncoding('%2e%2e', HttpStatus.OK);
     testEncoding('%252e%252e', HttpStatus.OK);
     testEncoding('/', HttpStatus.OK, false);
     testEncoding('%2f', HttpStatus.NOT_FOUND, false);
     testEncoding('%2f', HttpStatus.OK, true);
   });
 }