Reverse the sense of the flag to make it easier to find test that need to be converted

pkg/analysis_server/test/analysis/notification_analysis_options_test.dart

 // Copyright (c) 2015, 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.dart';
 import 'package:analysis_server/protocol/protocol_generated.dart'
     hide AnalysisOptions;
 import 'package:analysis_server/src/constants.dart';
 import 'package:analysis_server/src/domain_analysis.dart';
 import 'package:analyzer/src/generated/engine.dart';
@@ skipping 54 matching lines @@
 
   void setStrongMode(bool isSet) {
     addOptionsFile('''
 analyzer:
   strong-mode: $isSet
 ''');
   }
 
   @override
   void setUp() {
-    enableNewAnalysisDriver = true;
     generateSummaryFiles = true;
     registerLintRules();
     super.setUp();
     server.handlers = [new AnalysisDomainHandler(server)];
   }
 
   @override
   void tearDown() {
     filesErrors[optionsFilePath] = [];
     filesErrors[testFile] = [];
@@ skipping 250 matching lines @@
   @override
   String get optionsFilePath => '$projectPath/analysis_options.yaml';
 }
 
 @reflectiveTest
 class OldAnalysisOptionsFileNotificationTest
     extends AnalysisOptionsFileNotificationTest {
   @override
   String get optionsFilePath => '$projectPath/.analysis_options';
 }