Revise path library.

utils/pub/io.dart

 // Copyright (c) 2012, 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.
 
 /**
  * Helper functionality to make working with IO easier.
  */
 library io;
 
 import 'dart:io';
@@ skipping 32 matching lines @@
     return path.join(part1, part2, part3);
   } else if (part2 != null) {
     return path.join(part1, part2);
   } else {
     return path.join(part1);
   }
 }
 
 /// Gets the basename, the file name without any leading directory path, for
 /// [file], which can either be a [String], [File], or [Directory].
-String basename(file) => path.filename(_getPath(file));
+String basename(file) => path.basename(_getPath(file));
 
 // TODO(nweiz): move this into path.dart.
 /// Gets the the leading directory path for [file], which can either be a
 /// [String], [File], or [Directory].
 String dirname(file) {
   file = _sanitizePath(file);
 
   int lastSlash = file.lastIndexOf('/', file.length);
   if (lastSlash == -1) {
     return '.';
@@ skipping 1058 matching lines @@
   return new Directory(entry);
 }
 
 /**
  * Gets a [Uri] for [uri], which can either already be one, or be a [String].
  */
 Uri _getUri(uri) {
   if (uri is Uri) return uri;
   return new Uri.fromString(uri);
 }