Make the analysis server integration tests driver only.

pkg/analysis_server/test/integration/analysis/set_general_subscriptions_test.dart

 // Copyright (c) 2017, 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/plugin/protocol/protocol.dart';
 import 'package:test/test.dart';
 import 'package:test_reflective_loader/test_reflective_loader.dart';
 
 import '../integration_tests.dart';
 
@@ skipping 21 matching lines @@
     await sendAnalysisSetGeneralSubscriptions(
         [GeneralAnalysisService.ANALYZED_FILES]);
     await analysisFinished;
 
     expect(lastAnalyzedFiles, isNotEmpty);
     expect(lastAnalyzedFiles, contains(pathname));
     expect(
         lastAnalyzedFiles.any((String file) => file.endsWith('core/core.dart')),
         true);
   }
-
-  @override
-  bool get enableNewAnalysisDriver => true;
 }