Generate constants in server as we do in plugin

pkg/analysis_server/lib/src/search/search_domain.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_constants.dart';
 import 'package:analysis_server/src/analysis_server.dart';
-import 'package:analysis_server/src/constants.dart';
 import 'package:analysis_server/src/protocol_server.dart' as protocol;
 import 'package:analysis_server/src/search/element_references.dart';
 import 'package:analysis_server/src/search/type_hierarchy.dart';
 import 'package:analysis_server/src/services/index/index.dart';
 import 'package:analysis_server/src/services/search/search_engine.dart';
 import 'package:analyzer/dart/element/element.dart';
 
 /**
  * Instances of the class [SearchDomainHandler] implement a [RequestHandler]
  * that handles requests in the search domain.
@@ skipping 143 matching lines @@
     protocol.Response response =
         new protocol.SearchGetTypeHierarchyResult(hierarchyItems: items)
             .toResponse(request.id);
     server.sendResponse(response);
   }
 
   @override
   protocol.Response handleRequest(protocol.Request request) {
     try {
       String requestName = request.method;
-      if (requestName == SEARCH_FIND_ELEMENT_REFERENCES) {
+      if (requestName == SEARCH_REQUEST_FIND_ELEMENT_REFERENCES) {
         findElementReferences(request);
         return protocol.Response.DELAYED_RESPONSE;
-      } else if (requestName == SEARCH_FIND_MEMBER_DECLARATIONS) {
+      } else if (requestName == SEARCH_REQUEST_FIND_MEMBER_DECLARATIONS) {
         findMemberDeclarations(request);
         return protocol.Response.DELAYED_RESPONSE;
-      } else if (requestName == SEARCH_FIND_MEMBER_REFERENCES) {
+      } else if (requestName == SEARCH_REQUEST_FIND_MEMBER_REFERENCES) {
         findMemberReferences(request);
         return protocol.Response.DELAYED_RESPONSE;
-      } else if (requestName == SEARCH_FIND_TOP_LEVEL_DECLARATIONS) {
+      } else if (requestName == SEARCH_REQUEST_FIND_TOP_LEVEL_DECLARATIONS) {
         findTopLevelDeclarations(request);
         return protocol.Response.DELAYED_RESPONSE;
-      } else if (requestName == SEARCH_GET_TYPE_HIERARCHY) {
+      } else if (requestName == SEARCH_REQUEST_GET_TYPE_HIERARCHY) {
         getTypeHierarchy(request);
         return protocol.Response.DELAYED_RESPONSE;
       }
     } on protocol.RequestFailure catch (exception) {
       return exception.response;
     }
     return null;
   }
 
   void _sendSearchNotification(
@@ skipping 14 matching lines @@
   void _sendTypeHierarchyNull(protocol.Request request) {
     protocol.Response response =
         new protocol.SearchGetTypeHierarchyResult().toResponse(request.id);
     server.sendResponse(response);
   }
 
   static protocol.SearchResult toResult(SearchMatch match) {
     return protocol.newSearchResult_fromMatch(match);
   }
 }