Update the analysis server integration tests to always run on the analysis driver.

pkg/analysis_server/test/integration/execution/set_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 16 matching lines @@
         (await sendExecutionCreateContext(sourceDirectory.path)).id;
     expect(contextId, isNotNull);
 
     String pathname = sourcePath('lib/main.dart');
     writeFile(pathname, 'void main() {}');
 
     ExecutionLaunchDataParams data = await onExecutionLaunchData.first;
     expect(data.kind, ExecutableKind.SERVER);
     expect(data.file, pathname);
   }
-
-  @override
-  bool get enableNewAnalysisDriver => true;
 }