Make the analysis server integration tests driver only.

pkg/analysis_server/test/integration/analysis/set_analysis_roots_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:test/test.dart';
 import 'package:test_reflective_loader/test_reflective_loader.dart';
 
 import '../integration_tests.dart';
 
 main() {
@@ skipping 13 matching lines @@
   void bar() {}
 }
 ''');
 
     // Calling this will call analysis.setAnalysisRoots.
     standardAnalysisSetup();
 
     await analysisFinished;
     expect(currentAnalysisErrors[pathname], isEmpty);
   }
-
-  @override
-  bool get enableNewAnalysisDriver => true;
 }