Rename "pathos" package to "path".

pkg/scheduled_test/test/descriptor/directory_test.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.
 
 import 'dart:async';
 import 'dart:io';
 
-import 'package:pathos/path.dart' as path;
+import 'package:path/path.dart' as path;
 import 'package:scheduled_test/descriptor.dart' as d;
 import 'package:scheduled_test/scheduled_test.dart';
 
 import '../metatest.dart';
 import 'utils.dart';
 
 void main() {
   setUpTimeout();
 
   expectTestsPass("directory().create() creates a directory and its contents",
@@ skipping 387 matching lines @@
     });
   });
 
   expectTestsPass("directory().describe() with no contents returns the "
       "directory name", () {
     test('test', () {
       expect(d.dir('dir').describe(), equals('dir'));
     });
   });
 }