Remove old index and search implementations.

pkg/analysis_server/lib/src/services/search/search_engine.dart

Index: pkg/analysis_server/lib/src/services/search/search_engine.dart
diff --git a/pkg/analysis_server/lib/src/services/search/search_engine.dart b/pkg/analysis_server/lib/src/services/search/search_engine.dart
index 217048c8571d3200daba49c8982d19abec547009..e6d27385b63121e0d10ce31f214eb43e1d17f32f 100644
--- a/pkg/analysis_server/lib/src/services/search/search_engine.dart
+++ b/pkg/analysis_server/lib/src/services/search/search_engine.dart
@@ -6,8 +6,6 @@ library services.search_engine;
 
 import 'dart:async';
 
-import 'package:analysis_server/src/services/index/index.dart';
-import 'package:analysis_server/src/services/search/search_engine_internal.dart';
 import 'package:analyzer/dart/element/element.dart';
 import 'package:analyzer/dart/element/visitor.dart';
 import 'package:analyzer/src/dart/element/element.dart';
@@ -16,13 +14,6 @@ import 'package:analyzer/src/generated/java_core.dart';
 import 'package:analyzer/src/generated/source.dart';
 
 /**
- * Returns a new [SearchEngine] instance based on the given [Index].
- */
-SearchEngine createSearchEngine(Index index) {
-  return new SearchEngineImpl(index);
-}
-
-/**
  * Instances of the enum [MatchKind] represent the kind of reference that was
  * found when a match represents a reference to an element.
  */