Remove the auto-discovery of plugins

pkg/analysis_server/test/src/plugin/plugin_manager_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 'dart:async';
 import 'dart:io' as io;
 
 import 'package:analysis_server/src/plugin/notification_manager.dart';
 import 'package:analysis_server/src/plugin/plugin_manager.dart';
 import 'package:analyzer/context/context_root.dart';
@@ skipping 180 matching lines @@
 
 @reflectiveTest
 class PluginManagerFromDiskTest extends PluginTestSupport {
   String byteStorePath = '/byteStore';
   PluginManager manager;
 
   void setUp() {
     super.setUp();
     manager = new PluginManager(resourceProvider, byteStorePath, '',
         notificationManager, InstrumentationService.NULL_SERVICE);
-    manager.whitelistEverything();
   }
 
   test_addPluginToContextRoot() async {
     io.Directory pkg1Dir = io.Directory.systemTemp.createTempSync('pkg1');
     String pkgPath = pkg1Dir.resolveSymbolicLinksSync();
     await withPlugin(test: (String pluginPath) async {
       ContextRoot contextRoot = new ContextRoot(pkgPath, []);
       await manager.addPluginToContextRoot(contextRoot, pluginPath);
       await manager.stopAll();
     });
@@ skipping 698 matching lines @@
   }
 
   @override
   void sendRequest(Request request) {
     sentRequests.add(request);
     if (request.method == 'plugin.shutdown') {
       session.handleOnDone();
     }
   }
 }