Generate constants in server as we do in plugin

pkg/analysis_server/test/analysis/notification_outline_test.dart

Index: pkg/analysis_server/test/analysis/notification_outline_test.dart
diff --git a/pkg/analysis_server/test/analysis/notification_outline_test.dart b/pkg/analysis_server/test/analysis/notification_outline_test.dart
index b6018a273cdaca2a970b28c5d1473434ebac724c..69a440776f8d9fd55cc8a273bc21a74cceea90ce 100644
--- a/pkg/analysis_server/test/analysis/notification_outline_test.dart
+++ b/pkg/analysis_server/test/analysis/notification_outline_test.dart
@@ -5,8 +5,8 @@
 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';
@@ -33,7 +33,7 @@ class _AnalysisNotificationOutlineTest extends AbstractAnalysisTest {
   }
 
   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;