Generate constants in server as we do in plugin

pkg/analysis_server/test/analysis/notification_outline_test.dart

 // Copyright (c) 2014, the Dart project authors.  Please see the AUTHORS file
 // 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 'dart:async';
 
 import 'package:analysis_server/protocol/protocol.dart';
+import 'package:analysis_server/protocol/protocol_constants.dart';
 import 'package:analysis_server/protocol/protocol_generated.dart';
-import 'package:analysis_server/src/constants.dart';
 import 'package:analyzer_plugin/protocol/protocol_common.dart';
 import 'package:test/test.dart';
 import 'package:test_reflective_loader/test_reflective_loader.dart';
 
 import '../analysis_abstract.dart';
 
 main() {
   defineReflectiveSuite(() {
     defineReflectiveTests(_AnalysisNotificationOutlineTest);
   });
 }
 
 @reflectiveTest
 class _AnalysisNotificationOutlineTest extends AbstractAnalysisTest {
   FileKind fileKind;
   String libraryName;
   Outline outline;
 
   Completer _resultsAvailable = new Completer();
 
   Future prepareOutline() {
     addAnalysisSubscription(AnalysisService.OUTLINE, testFile);
     return _resultsAvailable.future;
   }
 
   void processNotification(Notification notification) {
-    if (notification.event == ANALYSIS_OUTLINE) {
+    if (notification.event == ANALYSIS_NOTIFICATION_OUTLINE) {
       var params = new AnalysisOutlineParams.fromNotification(notification);
       if (params.file == testFile) {
         fileKind = params.kind;
         libraryName = params.libraryName;
         outline = params.outline;
         _resultsAvailable.complete(null);
       }
     }
   }
 
@@ skipping 800 matching lines @@
   }
 
   void _isEnumConstant(Outline outline, String name) {
     Element element = outline.element;
     expect(element.kind, ElementKind.ENUM_CONSTANT);
     expect(element.name, name);
     expect(element.parameters, isNull);
     expect(element.returnType, isNull);
   }
 }