Regenerate pub sources.

sdk/lib/_internal/pub_generated/lib/src/validator/directory.dart

Index: sdk/lib/_internal/pub_generated/lib/src/validator/directory.dart
diff --git a/sdk/lib/_internal/pub_generated/lib/src/validator/directory.dart b/sdk/lib/_internal/pub_generated/lib/src/validator/directory.dart
index 0318932a178d833e61417a373ea7391cfdb33aa5..a9935e8461d922d33c43ad0555a33b26d5ea9033 100644
--- a/sdk/lib/_internal/pub_generated/lib/src/validator/directory.dart
+++ b/sdk/lib/_internal/pub_generated/lib/src/validator/directory.dart
@@ -1,29 +1,44 @@
+// 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 pub.validator.directory;
+
 import 'dart:async';
+
 import 'package:path/path.dart' as path;
+
 import '../entrypoint.dart';
 import '../io.dart';
 import '../validator.dart';
+
+/// A validator that validates a package's top-level directories.
 class DirectoryValidator extends Validator {
-  DirectoryValidator(Entrypoint entrypoint) : super(entrypoint);
+  DirectoryValidator(Entrypoint entrypoint)
+      : super(entrypoint);
+
   static final _PLURAL_NAMES = [
       "benchmarks",
       "docs",
       "examples",
       "tests",
       "tools"];
+
   Future validate() {
     return new Future.sync(() {
       for (var dir in listDir(entrypoint.root.dir)) {
         if (!dirExists(dir)) continue;
+
         dir = path.basename(dir);
         if (_PLURAL_NAMES.contains(dir)) {
+          // Cut off the "s"
           var singularName = dir.substring(0, dir.length - 1);
           warnings.add(
               'Rename the top-level "$dir" directory to ' '"$singularName".\n'
                   'The Pub layout convention is to use singular directory ' 'names.\n'
                   'Plural names won\'t be correctly identified by Pub and other ' 'tools.');
         }
+
         if (dir.contains(new RegExp(r"^samples?$"))) {
           warnings.add(
               'Rename the top-level "$dir" directory to "example".\n'