Remove more libraries directives from server

pkg/analysis_server/lib/src/source/caching_pub_package_map_provider.dart

Index: pkg/analysis_server/lib/src/source/caching_pub_package_map_provider.dart
diff --git a/pkg/analysis_server/lib/src/source/caching_pub_package_map_provider.dart b/pkg/analysis_server/lib/src/source/caching_pub_package_map_provider.dart
index 591e0eda4ada537c60d938db7425a09ad68586f7..99cfce7f7c3c2a247d2fcd86e722cd8964eaf95a 100644
--- a/pkg/analysis_server/lib/src/source/caching_pub_package_map_provider.dart
+++ b/pkg/analysis_server/lib/src/source/caching_pub_package_map_provider.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 source.caching_pub_package_map_provider;
-
 import 'dart:convert';
 import 'dart:core';
 import 'dart:io' as io;