Regenerate pub sources.

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

Index: sdk/lib/_internal/pub_generated/test/serve/missing_asset_test.dart
diff --git a/sdk/lib/_internal/pub_generated/test/serve/missing_asset_test.dart b/sdk/lib/_internal/pub_generated/test/serve/missing_asset_test.dart
index f1b901e54599b3eddbcb7f3b1b2e3295d5456dac..8bb69b0f4e429a523b8f932331b861def6d5b878 100644
--- a/sdk/lib/_internal/pub_generated/test/serve/missing_asset_test.dart
+++ b/sdk/lib/_internal/pub_generated/test/serve/missing_asset_test.dart
@@ -1,11 +1,18 @@
+// 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 for missing assets", () {
     d.dir(appPath, [d.appPubspec()]).create();
+
     pubServe();
     requestShould404("index.html");
     requestShould404("packages/myapp/nope.dart");