Make the analysis server integration tests driver only.

pkg/analysis_server/test/integration/analysis/set_priority_files_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';
 
 main() {
   defineReflectiveSuite(() {
     defineReflectiveTests(SetPriorityFilesTest);
   });
 }
 
 @reflectiveTest
 class SetPriorityFilesTest extends AbstractAnalysisServerIntegrationTest {
   test_options() async {
     String pathname = sourcePath('foo.dart');
     writeFile(pathname, 'class Foo { void baz() {} }');
     writeFile(sourcePath('bar.dart'), 'class Bar { void baz() {} }');
 
     standardAnalysisSetup();
     await sendAnalysisSetPriorityFiles([pathname]);
 
     ServerStatusParams status = await analysisFinished;
     expect(status.analysis.isAnalyzing, false);
   }
-
-  @override
-  bool get enableNewAnalysisDriver => true;
 }