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

pkg/analysis_server/test/domain_diagnostic_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_generated.dart';
 import 'package:analysis_server/src/domain_diagnostic.dart';
 import 'package:test/test.dart';
 import 'package:test_reflective_loader/test_reflective_loader.dart';
 
 import 'analysis_abstract.dart';
 
 main() {
   defineReflectiveSuite(() {
     defineReflectiveTests(DiagnosticDomainTest);
   });
 }
 
 @reflectiveTest
 class DiagnosticDomainTest extends AbstractAnalysisTest {
   @override
   void setUp() {
-    enableNewAnalysisDriver = true;
     generateSummaryFiles = true;
     super.setUp();
     handler = new DiagnosticDomainHandler(server);
     server.handlers = [handler];
   }
 
   test_getDiagnostics() async {
     String file = '/project/bin/test.dart';
     resourceProvider.newFile('/project/pubspec.yaml', 'name: project');
     resourceProvider.newFile(file, 'main() {}');
@@ skipping 17 matching lines @@
     expect(context.workItemQueueLength, isNotNull);
   }
 
   test_getDiagnostics_noRoot() async {
     var request = new DiagnosticGetDiagnosticsParams().toRequest('0');
     var response = handler.handleRequest(request);
     var result = new DiagnosticGetDiagnosticsResult.fromResponse(response);
     expect(result.contexts, isEmpty);
   }
 }