Get rid of all the library tags.

test/serve/does_not_watch_compiled_js_files_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() {
   integration("does not watch changes to compiled JS files in the package", () {
     d.dir(appPath, [
       d.appPubspec(),
       d.dir("web", [
         d.file("index.html", "body")
@@ skipping 15 matching lines @@
     ]).create();
 
     waitForBuildSuccess();
     requestShouldSucceed("file.dart", 'void main() => print("hello");');
     requestShould404("other.dart.js");
     requestShould404("other.dart.js.map");
     requestShould404("other.dart.precompiled.js");
     endPubServe();
   });
 }