Regenerate pub sources.

sdk/lib/_internal/pub_generated/test/serve/unknown_dependency_test.dart

+// Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS d.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_tests;
+
 import '../descriptor.dart' as d;
 import '../test_pub.dart';
 import 'utils.dart';
+
 main() {
   initConfig();
   integration("responds with a 404 unknown dependencies", () {
     d.dir(appPath, [d.appPubspec()]).create();
+
     pubServe();
     requestShould404("packages/foo/nope.dart");
     requestShould404("assets/foo/nope.png");
     requestShould404("dir/packages/foo/nope.dart");
     requestShould404("dir/assets/foo/nope.png");
     endPubServe();
   });
 }