Remove the non-driver versions of several tests

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.
 
 import 'package:analysis_server/protocol/protocol_generated.dart';
 import 'package:analyzer/dart/ast/ast.dart';
 import 'package:test/test.dart';
 import 'package:test_reflective_loader/test_reflective_loader.dart';
 
 import 'abstract_rename.dart';
 
 main() {
   defineReflectiveSuite(() {
     defineReflectiveTests(RenameImportTest);
-    defineReflectiveTests(RenameImportTest_Driver);
   });
 }
 
 @reflectiveTest
 class RenameImportTest extends RenameRefactoringTest {
+  @override
+  bool get enableNewAnalysisDriver => true;
+
   test_checkNewName() async {
     await indexTestUnit("import 'dart:async' as test;");
     _createRefactoring("import 'dart:");
     expect(refactoring.oldName, 'test');
     // null
     refactoring.newName = null;
     assertRefactoringStatus(
         refactoring.checkNewName(), RefactoringProblemSeverity.FATAL,
         expectedMessage: "Import prefix name must not be null.");
     // same
@@ skipping 191 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);
   }
 }
-
-@reflectiveTest
-class RenameImportTest_Driver extends RenameImportTest {
-  @override
-  bool get enableNewAnalysisDriver => true;
-}