Remove some more library directives

pkg/analysis_server/test/single_context_manager_test.dart

Index: pkg/analysis_server/test/single_context_manager_test.dart
diff --git a/pkg/analysis_server/test/single_context_manager_test.dart b/pkg/analysis_server/test/single_context_manager_test.dart
index cd343390aa4657b426cbfd64a55b4eb5435974a2..f469c8024c9e6dd8abb4aded76fd12504e0d9274 100644
--- a/pkg/analysis_server/test/single_context_manager_test.dart
+++ b/pkg/analysis_server/test/single_context_manager_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 test.analysis_server.src.single_context_manager;
-
 import 'dart:core';
 
 import 'package:analysis_server/src/single_context_manager.dart';