Get rid of all the library tags.

test/serve/missing_file_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 'package:path/path.dart' as path;
 import 'package:pub/src/io.dart';
 import 'package:scheduled_test/scheduled_test.dart';
 
 import '../descriptor.dart' as d;
 import '../test_pub.dart';
 import 'utils.dart';
 
 main() {
   integration("responds with a 404 for missing source files", () {
@@ skipping 22 matching lines @@
     // TODO(rnystrom): It's possible for these requests to happen quickly
     // enough that the file system hasn't notified for the deletions yet. If
     // that happens, we can probably just add a short delay here.
 
     requestShould404("index.html");
     requestShould404("packages/myapp/nope.dart");
     requestShould404("dir/packages/myapp/nope.dart");
     endPubServe();
   });
 }