Regenerate pub sources.

sdk/lib/_internal/pub_generated/test/serve/invalid_urls_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 on incomplete special URLs", () {
     d.dir("foo", [d.libPubspec("foo", "0.0.1")]).create();
+
     d.dir(appPath, [d.appPubspec({
         "foo": {
           "path": "../foo"
         }
       }),
-          d.dir("lib", [d.file("packages")]),
-          d.dir("web", [d.file("packages")])]).create();
+          d.dir(
+              "lib",
+              [// Make a file that maps to the special "packages" directory to ensure
+        // it is *not* found.
+        d.file("packages")]), d.dir("web", [d.file("packages")])]).create();
+
     pubGet();
     pubServe();
     requestShould404("packages");
     requestShould404("packages/");
     requestShould404("packages/myapp");
     requestShould404("packages/myapp/");
     requestShould404("packages/foo");
     requestShould404("packages/foo/");
     requestShould404("packages/unknown");
     requestShould404("packages/unknown/");
     endPubServe();
   });
+
 }