Switch the default from non-driver to driver in several tests

pkg/analysis_server/test/services/refactoring/rename_unit_member_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.
 
 import 'package:analysis_server/protocol/protocol_generated.dart';
 import 'package:analysis_server/src/services/correction/status.dart';
 import 'package:test/test.dart';
 import 'package:test_reflective_loader/test_reflective_loader.dart';
 
 import 'abstract_rename.dart';
 
 main() {
   defineReflectiveSuite(() {
     defineReflectiveTests(RenameUnitMemberTest);
   });
 }
 
 @reflectiveTest
 class RenameUnitMemberTest extends RenameRefactoringTest {
-  @override
-  bool get enableNewAnalysisDriver => true;
-
   test_checkFinalConditions_hasTopLevel_ClassElement() async {
     await indexTestUnit('''
 class Test {}
 class NewName {} // existing
 ''');
     createRenameRefactoringAtString('Test {}');
     // check status
     refactoring.newName = 'NewName';
     RefactoringStatus status = await refactoring.checkFinalConditions();
     assertRefactoringStatus(status, RefactoringProblemSeverity.ERROR,
@@ skipping 584 matching lines @@
     return assertSuccessfulRefactoring('''
 int newName = 0;
 main() {
   print(newName);
   newName = 1;
   newName += 2;
 }
 ''');
   }
 }