Remove the Path class from dart:io

pkg/http_server/test/virtual_directory_test.dart

Index: pkg/http_server/test/virtual_directory_test.dart
diff --git a/pkg/http_server/test/virtual_directory_test.dart b/pkg/http_server/test/virtual_directory_test.dart
index 0136b62def67177b57fb5ef6d20291346a7e232f..4b59f2c29278c428a6dcebc3129881b383b6357b 100644
--- a/pkg/http_server/test/virtual_directory_test.dart
+++ b/pkg/http_server/test/virtual_directory_test.dart
@@ -5,8 +5,9 @@
 import 'dart:async';
 import 'dart:io';
 
-import "package:unittest/unittest.dart";
 import "package:http_server/http_server.dart";
+import "package:path/path.dart";
+import "package:unittest/unittest.dart";
 
 import 'utils.dart';
 
@@ -296,7 +297,7 @@ void main() {
           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');