Generate constants in server as we do in plugin

pkg/analysis_server/test/analysis/notification_analyzedFiles_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:test/test.dart';
 import 'package:test_reflective_loader/test_reflective_loader.dart';
 
 import '../analysis_abstract.dart';
 import '../mocks.dart';
 
 main() {
   defineReflectiveSuite(() {
     defineReflectiveTests(AnalysisNotificationAnalyzedFilesTest);
   });
 }
 
 @reflectiveTest
 class AnalysisNotificationAnalyzedFilesTest extends AbstractAnalysisTest {
   List<String> analyzedFiles;
   bool analyzedFilesReceived = false;
 
   void assertHasFile(String filePath) {
     expect(analyzedFilesReceived, isTrue);
     expect(analyzedFiles, contains(filePath));
   }
 
   Future<Null> prepareAnalyzedFiles() async {
     addGeneralAnalysisSubscription(GeneralAnalysisService.ANALYZED_FILES);
     await pumpEventQueue();
   }
 
   void processNotification(Notification notification) {
-    if (notification.event == ANALYSIS_ANALYZED_FILES) {
+    if (notification.event == ANALYSIS_NOTIFICATION_ANALYZED_FILES) {
       AnalysisAnalyzedFilesParams params =
           new AnalysisAnalyzedFilesParams.fromNotification(notification);
       analyzedFilesReceived = true;
       analyzedFiles = params.directories;
     }
   }
 
   void setUp() {
     generateSummaryFiles = true;
     super.setUp();
@@ skipping 56 matching lines @@
     analyzedFilesReceived = false;
     modifyTestFile('import "/foo.dart";');
     await prepareAnalyzedFiles();
     assertHasFile('/foo.dart');
   }
 
   void unsubscribeAnalyzedFiles() {
     removeGeneralAnalysisSubscription(GeneralAnalysisService.ANALYZED_FILES);
   }
 }