Remove the old task model

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/domain_analysis.dart';
 import 'package:analyzer/src/generated/engine.dart';
 import 'package:analyzer/src/services/lint.dart';
 import 'package:linter/src/linter.dart';
 import 'package:test_reflective_loader/test_reflective_loader.dart';
 import 'package:unittest/unittest.dart';
 
 import '../analysis_abstract.dart';
 import '../utils.dart';
 
 main() {
   initializeTestEnvironment();
   defineReflectiveTests(NotificationErrorsTest);
 }
 
 @reflectiveTest
 class NotificationErrorsTest extends AbstractAnalysisTest {
   Map<String, List<AnalysisError>> filesErrors = {};
 
-  /// Cached model state in case tests need to set task model to on/off.
-  bool wasTaskModelEnabled;
-
   void processNotification(Notification notification) {
     if (notification.event == ANALYSIS_ERRORS) {
       var decoded = new AnalysisErrorsParams.fromNotification(notification);
       filesErrors[decoded.file] = decoded.errors;
     }
   }
 
   @override
   void setUp() {
     super.setUp();
     server.handlers = [new AnalysisDomainHandler(server),];
-    wasTaskModelEnabled = AnalysisEngine.instance.useTaskModel;
-  }
-
-  @override
-  void tearDown() {
-    AnalysisEngine.instance.useTaskModel = wasTaskModelEnabled;
-    super.tearDown();
   }
 
   test_importError() async {
     createProject();
 
     addTestFile('''
 import 'does_not_exist.dart';
 ''');
     await waitForTasksFinished();
     List<AnalysisError> errors = filesErrors[testFile];
     // Verify that we are generating only 1 error for the bad URI.
     // https://github.com/dart-lang/sdk/issues/23754
     expect(errors, hasLength(1));
     AnalysisError error = errors[0];
     expect(error.severity, AnalysisErrorSeverity.ERROR);
     expect(error.type, AnalysisErrorType.COMPILE_TIME_ERROR);
     expect(error.message, startsWith('Target of URI does not exist'));
   }
 
   test_lintError() async {
-    // Requires task model.
-    AnalysisEngine.instance.useTaskModel = true;
-
     var camelCaseTypesLintName = 'camel_case_types';
 
     addFile(
         '$projectPath/.analysis_options',
         '''
 linter:
   rules:
     - $camelCaseTypesLintName
 ''');
 
@@ skipping 57 matching lines @@
 }
 ''');
     await waitForTasksFinished();
     List<AnalysisError> errors = filesErrors[testFile];
     expect(errors, hasLength(1));
     AnalysisError error = errors[0];
     expect(error.severity, AnalysisErrorSeverity.WARNING);
     expect(error.type, AnalysisErrorType.STATIC_WARNING);
   }
 }