Replace @ReflectiveTestCase() with @reflectiveTest.

pkg/analysis_server/test/services/refactoring/rename_import_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.refactoring.rename_import;
 
 import 'package:analysis_server/src/protocol.dart';
 import 'package:analyzer/src/generated/ast.dart';
 import 'package:unittest/unittest.dart';
 
 import '../../reflective_tests.dart';
 import 'abstract_rename.dart';
 
 
 main() {
   groupSep = ' | ';
   runReflectiveTests(RenameImportTest);
 }
 
 
-@ReflectiveTestCase()
+@reflectiveTest
 class RenameImportTest extends RenameRefactoringTest {
   test_checkNewName() {
     indexTestUnit("import 'dart:async' as test;");
     _createRefactoring("import 'dart:");
     expect(refactoring.oldName, 'test');
     // null
     refactoring.newName = null;
     assertRefactoringStatus(
         refactoring.checkNewName(),
         RefactoringProblemSeverity.FATAL,
@@ skipping 149 matching lines @@
     expect(refactoring.refactoringName, 'Rename Import Prefix');
     expect(refactoring.oldName, '');
   }
 
   void _createRefactoring(String search) {
     ImportDirective directive =
         findNodeAtString(search, (node) => node is ImportDirective);
     createRenameRefactoringForElement(directive.element);
   }
 }