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

pkg/analysis_server/test/services/search/hierarchy_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.src.search.hierarchy;
 
 import 'dart:async';
 
 import 'package:analysis_server/src/services/search/hierarchy.dart';
 import 'package:analysis_server/src/services/search/search_engine_internal2.dart';
 import 'package:analyzer/dart/element/element.dart';
 import 'package:test/test.dart';
 import 'package:test_reflective_loader/test_reflective_loader.dart';
 
 import '../../abstract_single_unit.dart';
 
 main() {
   defineReflectiveSuite(() {
     defineReflectiveTests(HierarchyTest);
   });
 }
 
 @reflectiveTest
 class HierarchyTest extends AbstractSingleUnitTest {
   SearchEngineImpl2 searchEngine;
 
-  @override
-  bool get enableNewAnalysisDriver => true;
-
   void setUp() {
     super.setUp();
     searchEngine = new SearchEngineImpl2([driver]);
   }
 
   test_getClassMembers() async {
     await _indexTestUnit('''
 class A {
   A() {}
   var ma1;
@@ skipping 318 matching lines @@
     {
       Set<ClassElement> supers = getSuperClasses(classF);
       expect(supers, unorderedEquals([objectElement, classA]));
     }
   }
 
   Future<Null> _indexTestUnit(String code) async {
     await resolveTestUnit(code);
   }
 }