Rename "pathos" package to "path".

pkg/scheduled_test/test/descriptor/file_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('file().create() creates a file', () {
@@ skipping 242 matching lines @@
 
     test('test 2', () {
       expect(errors, everyElement(new isInstanceOf<ScheduleError>()));
       expect(errors.map((e) => e.error.message), equals([
         "Expected: contains <12>\n"
         "  Actual: [98, 97, 114, 102, 111, 111, 98, 97, 122]"
       ]), verbose: true);
     });
   }, passing: ['test 2']);
 }