Get rid of all the library tags.

test/serve/web_socket/url_to_asset_id_test.dart

 // Copyright (c) 2014, 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:scheduled_test/scheduled_test.dart';
 import '../../descriptor.dart' as d;
 import '../../test_pub.dart';
 import '../utils.dart';
 
 main() {
   // TODO(rnystrom): Split into independent tests.
   setUp(() {
     d.dir("foo", [
       d.libPubspec("foo", "0.0.1"),
@@ skipping 72 matching lines @@
 
   integration("converts URLs to matching asset ids in a dependency's lib/", () {
     // Path in lib/.
     pubServe();
     expectWebSocketResult("urlToAssetId", {
       "url": getServerUrl("web", "packages/foo/foo.dart")
     }, {"package": "foo", "path": "lib/foo.dart"});
     endPubServe();
   });
 }