Remove the options plugin

pkg/analyzer/lib/src/task/options.dart

Index: pkg/analyzer/lib/src/task/options.dart
diff --git a/pkg/analyzer/lib/src/task/options.dart b/pkg/analyzer/lib/src/task/options.dart
index 78a93c7f7b0b2735f8ab9647a9c330113af1d60e..6995b2af3f37d9c8045f0fb3e76c748bff32b12a 100644
--- a/pkg/analyzer/lib/src/task/options.dart
+++ b/pkg/analyzer/lib/src/task/options.dart
@@ -16,6 +16,7 @@ import 'package:analyzer/src/generated/source.dart';
 import 'package:analyzer/src/generated/utilities_general.dart';
 import 'package:analyzer/src/lint/config.dart';
 import 'package:analyzer/src/lint/linter.dart';
+import 'package:analyzer/src/lint/options_rule_validator.dart';
 import 'package:analyzer/src/lint/registry.dart';
 import 'package:analyzer/src/task/general.dart';
 import 'package:analyzer/src/util/yaml.dart';
@@ -390,16 +391,16 @@ class LinterOptionsValidator extends TopLevelOptionValidator {
 
 /// Validates options defined in an analysis options file.
 class OptionsFileValidator {
-  // TODO(pq): move to an extension point.
+  /// The source being validated.
+  final Source source;
+
   final List<OptionsValidator> _validators = [
     new AnalyzerOptionsValidator(),
-    new LinterOptionsValidator()
+    new LinterOptionsValidator(),
+    new LinterRuleOptionsValidator()
   ];
 
-  final Source source;
-  OptionsFileValidator(this.source) {
-    _validators.addAll(AnalysisEngine.instance.optionsPlugin.optionsValidators);
-  }
+  OptionsFileValidator(this.source);
 
   List<AnalysisError> validate(Map<String, YamlNode> options) {
     RecordingErrorListener recorder = new RecordingErrorListener();