Remove more libraries directives from server

pkg/analysis_server/lib/src/context_manager.dart

Index: pkg/analysis_server/lib/src/context_manager.dart
diff --git a/pkg/analysis_server/lib/src/context_manager.dart b/pkg/analysis_server/lib/src/context_manager.dart
index 096e4a6936673c67c2b1943b33b604011efecfae..6d75ff6c1d8e63d041ae1688f7c9afd9af50ddf4 100644
--- a/pkg/analysis_server/lib/src/context_manager.dart
+++ b/pkg/analysis_server/lib/src/context_manager.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 context.directory.manager;
-
 import 'dart:async';
 import 'dart:collection';
 import 'dart:convert';