Get rid of old redundant methods in io.dart.

utils/pub/package.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.
 
 library package;
 
 import 'dart:async';
+
+import '../../pkg/path/lib/path.dart' as path;
+
 import 'io.dart';
 import 'pubspec.dart';
 import 'source.dart';
 import 'source_registry.dart';
 import 'version.dart';
 
 final _README_REGEXP = new RegExp(r"^README($|\.)", caseSensitive: false);
 
 /// A named, versioned, unit of code and resource reuse.
 class Package {
   /// The path to the directory containing the package.
   final String dir;
 
   /// The name of the package.
   String get name {
     if (pubspec.name != null) return pubspec.name;
-    if (dir != null) return basename(dir);
+    if (dir != null) return path.basename(dir);
     return null;
   }
 
   /// The package's version.
   Version get version => pubspec.version;
 
   /// The parsed pubspec associated with this package.
   final Pubspec pubspec;
 
   /// The ids of the packages that this package depends on. This is what is
@@ skipping 170 matching lines @@
 
 class PubspecNameMismatchException implements Exception {
   final String expectedName;
   final String actualName;
 
   PubspecNameMismatchException(this.expectedName, this.actualName);
 
   String toString() => 'The name you specified for your dependency, '
     '"$expectedName", doesn\'t match the name "$actualName" in its pubspec.';
 }