Unify the server and plugin versions of the generators

pkg/analysis_server/test/src/plugin/notification_manager_test.dart

Index: pkg/analysis_server/test/src/plugin/notification_manager_test.dart
diff --git a/pkg/analysis_server/test/src/plugin/notification_manager_test.dart b/pkg/analysis_server/test/src/plugin/notification_manager_test.dart
index c240c695f21d411f6b7e872a3cb1ff49e3835308..b169197c01204f2b65c1909c9d285f6f98608377 100644
--- a/pkg/analysis_server/test/src/plugin/notification_manager_test.dart
+++ b/pkg/analysis_server/test/src/plugin/notification_manager_test.dart
@@ -2,7 +2,8 @@
 // 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.
 
-import 'package:analysis_server/plugin/protocol/protocol.dart' as server;
+import 'package:analysis_server/protocol/protocol.dart' as server;
+import 'package:analysis_server/protocol/protocol_generated.dart' as server;
 import 'package:analysis_server/src/channel/channel.dart';
 import 'package:analysis_server/src/plugin/notification_manager.dart';
 import 'package:analyzer/file_system/memory_file_system.dart';