Remove some more library directives

pkg/analysis_server/tool/spec/check_all_test.dart

Index: pkg/analysis_server/tool/spec/check_all_test.dart
diff --git a/pkg/analysis_server/tool/spec/check_all_test.dart b/pkg/analysis_server/tool/spec/check_all_test.dart
index f6a8790621a95264edf49b92c1389b361823d50b..3625eb59c0e6bde210e5e8a16ea632cd6b584062 100644
--- a/pkg/analysis_server/tool/spec/check_all_test.dart
+++ b/pkg/analysis_server/tool/spec/check_all_test.dart
@@ -2,8 +2,6 @@
 // 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 check.all;
-
 import 'dart:io';
 
 import 'package:front_end/src/codegen/tools.dart';