Get rid of all the library tags.

test/snapshot/recompiles_if_the_sdk_is_out_of_date_test.dart

 // Copyright (c) 2014, the Dart project authors.  Please see the AUTHORS 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 p;
 import 'package:scheduled_test/scheduled_test.dart';
 import 'package:scheduled_test/scheduled_stream.dart';
 
 import '../descriptor.dart' as d;
 import '../test_pub.dart';
 
 main() {
   integration("creates a snapshot for an immediate dependency's executables",
       () {
@@ skipping 18 matching lines @@
     process.stdout.expect("Precompiling executables...");
     process.stdout.expect(consumeThrough("hello!"));
     process.shouldExit();
 
     d.dir(p.join(appPath, '.pub', 'bin'), [
       d.file('sdk-version', '0.1.2+3'),
       d.dir('foo', [d.matcherFile('hello.dart.snapshot', contains('hello!'))])
     ]).create();
   });
 }