Remove the old index.

pkg/analysis_server/test/domain_completion_util.dart

Index: pkg/analysis_server/test/domain_completion_util.dart
diff --git a/pkg/analysis_server/test/domain_completion_util.dart b/pkg/analysis_server/test/domain_completion_util.dart
index e1c190d8611b17d9acf4e87b4122f47d1dbfaa7c..6f1da485995a94104c327b96f17f6bf31d180e76 100644
--- a/pkg/analysis_server/test/domain_completion_util.dart
+++ b/pkg/analysis_server/test/domain_completion_util.dart
@@ -10,7 +10,6 @@ import 'package:analysis_server/protocol/protocol_generated.dart';
 import 'package:analysis_server/src/constants.dart';
 import 'package:analysis_server/src/domain_completion.dart';
 import 'package:analysis_server/src/provisional/completion/dart/completion_dart.dart';
-import 'package:analysis_server/src/services/index/index.dart';
 import 'package:analyzer_plugin/protocol/protocol_common.dart';
 import 'package:test/test.dart';
 
@@ -78,11 +77,6 @@ class AbstractCompletionDomainTest extends AbstractAnalysisTest {
     expect(id.isNotEmpty, isTrue);
   }
 
-  @override
-  Index createIndex() {
-    return createMemoryIndex();
-  }
-
   Future getSuggestions() async {
     await waitForTasksFinished();