Replace @ReflectiveTestCase() with @reflectiveTest.

pkg/analysis_server/test/context_manager_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.context.directory.manager;
 
 import 'package:analysis_server/src/context_manager.dart';
 import 'package:analyzer/file_system/file_system.dart';
 import 'package:analyzer/file_system/memory_file_system.dart';
 import 'package:analyzer/source/package_map_provider.dart';
 import 'package:analyzer/source/package_map_resolver.dart';
 import 'package:analyzer/src/generated/engine.dart';
 import 'package:analyzer/src/generated/source.dart';
 import 'package:analyzer/src/generated/source_io.dart';
 import 'package:path/path.dart';
 import 'package:unittest/unittest.dart';
 
 import 'mocks.dart';
 import 'reflective_tests.dart';
 
 
 main() {
   groupSep = ' | ';
   runReflectiveTests(ContextManagerTest);
 }
 
 
-@ReflectiveTestCase()
+@reflectiveTest
 class ContextManagerTest {
   TestContextManager manager;
   MemoryResourceProvider resourceProvider;
   MockPackageMapProvider packageMapProvider;
 
   String projPath = '/my/proj';
 
   void setUp() {
     resourceProvider = new MemoryResourceProvider();
     packageMapProvider = new MockPackageMapProvider();
@@ skipping 810 matching lines @@
     currentContextFilePaths.remove(path);
     currentContextPackageUriResolvers.remove(path);
   }
 
   @override
   void updateContextPackageUriResolver(Folder contextFolder,
       UriResolver packageUriResolver) {
     currentContextPackageUriResolvers[contextFolder.path] = packageUriResolver;
   }
 }