Rename "pathos" package to "path".

pkg/path/test/path_test.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.
 
 import 'package:unittest/unittest.dart';
-import 'package:pathos/path.dart' as path;
+import 'package:path/path.dart' as path;
 
 main() {
   group('path.Style', () {
     test('name', () {
       expect(path.Style.posix.name, 'posix');
       expect(path.Style.windows.name, 'windows');
     });
 
     test('separator', () {
       expect(path.Style.posix.separator, '/');
@@ skipping 11 matching lines @@
       var builder = new path.Builder(root: '/a/b/c');
       expect(builder.root, '/a/b/c');
     });
 
     test('uses the given style', () {
       var builder = new path.Builder(style: path.Style.windows);
       expect(builder.style, path.Style.windows);
     });
   });
 }