Replace @ReflectiveTestCase() with @reflectiveTest.

pkg/analysis_server/test/services/completion/completion_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.services.completion.manager;
 
 import 'package:analysis_server/src/services/completion/completion_manager.dart';
 import 'package:analysis_server/src/services/completion/dart_completion_manager.dart';
 import 'package:analyzer/src/generated/source.dart';
 import 'package:unittest/unittest.dart';
 
 import '../../abstract_context.dart';
 import '../../reflective_tests.dart';
 
 main() {
   groupSep = ' | ';
   runReflectiveTests(CompletionManagerTest);
 }
 
-@ReflectiveTestCase()
+@reflectiveTest
 class CompletionManagerTest extends AbstractContextTest {
   var perf = new CompletionPerformance();
 
   test_dart() {
     Source source = addSource('/does/not/exist.dart', '');
     var manager = new CompletionManager.create(context, source, null);
     expect(manager.runtimeType, DartCompletionManager);
   }
 
   test_html() {
     Source source = addSource('/does/not/exist.html', '');
     var manager = new CompletionManager.create(context, source, null);
     expect(manager.runtimeType, NoOpCompletionManager);
   }
 
   test_null_context() {
     Source source = addSource('/does/not/exist.dart', '');
     var manager = new CompletionManager.create(null, source, null);
     expect(manager.runtimeType, NoOpCompletionManager);
   }
 
   test_other() {
     Source source = addSource('/does/not/exist.foo', '');
     var manager = new CompletionManager.create(context, source, null);
     expect(manager.runtimeType, NoOpCompletionManager);
   }
 }