Move the linter core to the analyzer package

pkg/analysis_server/test/analysis/notification_errors_test.dart

 // Copyright (c) 2014, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 library test.analysis.notification_errors;
 
 import 'package:analysis_server/plugin/protocol/protocol.dart';
 import 'package:analysis_server/src/constants.dart';
 import 'package:analysis_server/src/context_manager.dart';
 import 'package:analysis_server/src/domain_analysis.dart';
 import 'package:analyzer/src/dart/analysis/driver.dart';
 import 'package:analyzer/src/generated/engine.dart';
+import 'package:analyzer/src/lint/linter.dart';
 import 'package:analyzer/src/services/lint.dart';
-import 'package:linter/src/linter.dart';
 import 'package:test/test.dart';
 import 'package:test_reflective_loader/test_reflective_loader.dart';
 
 import '../analysis_abstract.dart';
 import '../mocks.dart';
 
 main() {
   defineReflectiveSuite(() {
     defineReflectiveTests(NotificationErrorsTest);
     defineReflectiveTests(NotificationErrorsTest_Driver);
@@ skipping 139 matching lines @@
   }
 
   @failingTest
   @override
   test_importError() {
     // The overridden test is failing because we're getting an 'unused import'
     // hint rather than a URI does not exist error.
     return super.test_importError();
   }
 }