Backed out validator registration.

pkg/analysis_server/lib/src/plugin/server_plugin.dart

Index: pkg/analysis_server/lib/src/plugin/server_plugin.dart
diff --git a/pkg/analysis_server/lib/src/plugin/server_plugin.dart b/pkg/analysis_server/lib/src/plugin/server_plugin.dart
index 7ba32b3942427cf1109d62d59c8a44dc5c53059e..c008c1ca1ab627d124998f12883f9bc330d2bc33 100644
--- a/pkg/analysis_server/lib/src/plugin/server_plugin.dart
+++ b/pkg/analysis_server/lib/src/plugin/server_plugin.dart
@@ -31,9 +31,7 @@ import 'package:analysis_server/src/search/search_domain.dart';
 import 'package:analysis_server/src/services/correction/assist_internal.dart';
 import 'package:analysis_server/src/services/correction/fix_internal.dart';
 import 'package:analysis_server/src/services/index/index_contributor.dart';
-import 'package:analysis_server/src/services/linter/linter.dart';
 import 'package:analyzer/file_system/file_system.dart';
-import 'package:analyzer/plugin/options.dart';
 import 'package:analyzer/src/generated/engine.dart';
 import 'package:plugin/plugin.dart';
 
@@ -321,11 +319,6 @@ class ServerPlugin implements Plugin {
     registerExtension(
         INDEX_CONTRIBUTOR_EXTENSION_POINT_ID, new DartIndexContributor());
 
-    //
-    // Register options validators.
-    //
-    registerExtension(
-        OPTIONS_VALIDATOR_EXTENSION_POINT_ID, new LinterRuleOptionsValidator());
   }
 
   /**