Remove the Path class from dart:io

pkg/http_server/test/utils.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 utils;
 
 import 'dart:async';
 import 'dart:io';
-
+import "package:path/path.dart";
 
 Future<int> getStatusCode(int port,
                           String path,
                           {String host,
                            bool secure: false,
                            DateTime ifModifiedSince,
                            bool rawPath: false}) {
   var uri;
   if (rawPath) {
     uri = new Uri(scheme: secure ? 'https' : 'http',
@@ skipping 30 matching lines @@
   return new HttpClient().get('localhost', port, path)
       .then((request) => request.close())
       .then((response) => StringDecoder.decode(response));
 }
 
 
 const CERTIFICATE = "localhost_cert";
 
 
 setupSecure() {
-  Path scriptDir = new Path(new Options().script).directoryPath;
-  Path certificateDatabase = scriptDir.append('pkcert');
-  SecureSocket.initialize(database: certificateDatabase.toNativePath(),
+  String scriptDir = dirname(new Options().script);
+  String certificateDatabase = join(scriptDir, 'pkcert');
+  SecureSocket.initialize(database: certificateDatabase,
                           password: 'dartdart');
 }