Remove ability to disable new analysis driver

pkg/analysis_server/test/analysis_abstract.dart

 // Copyright (c) 2014, 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 'dart:async';
 
 import 'package:analysis_server/protocol/protocol.dart';
 import 'package:analysis_server/protocol/protocol_generated.dart'
     hide AnalysisOptions;
 import 'package:analysis_server/src/analysis_server.dart';
@@ skipping 121 matching lines @@
     //
     // Create an SDK in the mock file system.
     //
     new MockSdk(
         generateSummaryFiles: generateSummaryFiles,
         resourceProvider: resourceProvider);
     //
     // Create server
     //
     AnalysisServerOptions options = new AnalysisServerOptions();
-    options.enableNewAnalysisDriver = true;
     return new AnalysisServer(
         serverChannel,
         resourceProvider,
         packageMapProvider,
         index,
         serverPlugin,
         options,
         new DartSdkManager(resourceProvider.convertPath('/'), true),
         InstrumentationService.NULL_SERVICE);
   }
@@ skipping 211 matching lines @@
   Future<List<Null>> stopAll() async {
     fail('Unexpected invocation of stopAll');
     return null;
   }
 
   @override
   void whitelistEverything() {
     fail('Unexpected invocation of whitelistEverything');
   }
 }