Remove more libraries directives from server

pkg/analysis_server/lib/src/watch_manager.dart

Index: pkg/analysis_server/lib/src/watch_manager.dart
diff --git a/pkg/analysis_server/lib/src/watch_manager.dart b/pkg/analysis_server/lib/src/watch_manager.dart
index b961dd392ce46a63f5685d84361454716f9411a6..8a3fc97d80925956a2f58862b4726f940b612f92 100644
--- a/pkg/analysis_server/lib/src/watch_manager.dart
+++ b/pkg/analysis_server/lib/src/watch_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:core';