Use IndexContributor(s) in LocalIndex.

pkg/analysis_server/test/services/refactoring/move_file_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.
 
 library test.services.refactoring.move_files;
 
 import 'dart:async';
 
 import 'package:analysis_server/src/services/refactoring/refactoring.dart';
 import 'package:analyzer/file_system/file_system.dart';
@@ skipping 273 matching lines @@
   }
 
   void _performAnalysis() {
     while (true) {
       AnalysisResult result = context.performAnalysisTask();
       if (!result.hasMoreWork) {
         break;
       }
       for (ChangeNotice notice in result.changeNotices) {
         if (notice.source.fullName.startsWith('/project/')) {
-          index.indexUnit(context, notice.resolvedDartUnit);
+          index.index(context, notice.resolvedDartUnit);
         }
       }
     }
   }
 }