Replace @ReflectiveTestCase() with @reflectiveTest.

pkg/analyzer/test/generated/static_warning_code_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 engine.static_warning_code_test;
 
 import 'package:analyzer/src/generated/error.dart';
 import 'package:analyzer/src/generated/parser.dart' show ParserErrorCode;
 import 'package:analyzer/src/generated/source_io.dart';
 import 'package:unittest/unittest.dart';
 
 import '../reflective_tests.dart';
 import 'resolver_test.dart';
 
 
 main() {
   groupSep = ' | ';
   runReflectiveTests(StaticWarningCodeTest);
 }
 
-@ReflectiveTestCase()
+@reflectiveTest
 class StaticWarningCodeTest extends ResolverTestCase {
   void fail_undefinedGetter() {
     Source source = addSource(r'''
 ''');
     resolve(source);
     assertErrors(source, [StaticWarningCode.UNDEFINED_GETTER]);
     verify([source]);
   }
 
   void fail_undefinedIdentifier_commentReference() {
@@ skipping 3481 matching lines @@
 
   void test_voidReturnForGetter() {
     Source source = addSource(r'''
 class S {
   void get value {}
 }''');
     resolve(source);
     assertErrors(source, [StaticWarningCode.VOID_RETURN_FOR_GETTER]);
   }
 }