Revert "Move the linter core to the analyzer package"

pkg/analysis_server/test/context_manager_test.dart

Index: pkg/analysis_server/test/context_manager_test.dart
diff --git a/pkg/analysis_server/test/context_manager_test.dart b/pkg/analysis_server/test/context_manager_test.dart
index 16170378c9644b1d16966ea4632533ea71d0bdff..c95252b21a13f7905bbdd925d1e7d1ec09281b44 100644
--- a/pkg/analysis_server/test/context_manager_test.dart
+++ b/pkg/analysis_server/test/context_manager_test.dart
@@ -22,7 +22,6 @@ import 'package:analyzer/src/generated/source_io.dart';
 import 'package:analyzer/src/services/lint.dart';
 import 'package:analyzer/src/util/glob.dart';
 import 'package:linter/src/plugin/linter_plugin.dart';
-import 'package:linter/src/rules.dart';
 import 'package:linter/src/rules/avoid_as.dart';
 import 'package:path/path.dart' as path;
 import 'package:plugin/manager.dart';
@@ -1783,8 +1782,6 @@ abstract class ContextManagerTest {
     plugins.add(linterPlugin);
     ExtensionManager manager = new ExtensionManager();
     manager.processPlugins(plugins);
-
-    registerLintRules();
   }
 
   UriResolver providePackageResolver(Folder folder) => packageResolver;