Replace @ReflectiveTestCase() with @reflectiveTest.

pkg/analysis_server/test/integration/completion/get_suggestions_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.integration.completion.get.suggestions;
 
 import 'dart:async';
 
 import 'package:unittest/unittest.dart';
 
 import '../../reflective_tests.dart';
 import '../integration_tests.dart';
 
 main() {
   runReflectiveTests(Test);
 }
 
-@ReflectiveTestCase()
+@reflectiveTest
 class Test extends AbstractAnalysisServerIntegrationTest {
   fail_test_getSuggestions_string_var() {
     // See dartbug.com/20188
     String pathname = sourcePath('test.dart');
     String text = r'''
 var test = '';
 main() {
   test.
 }
 ''';
@@ skipping 14 matching lines @@
       });
     });
   }
 
   test_placeholder() {
     // The unit test framework freaks out if there are no tests, so this is a
     // placeholder until we have a passing test.
     // TODO(paulberry): remove this.
   }
 }