Remove uses of the old plugin model from the analysis server

pkg/analysis_server/lib/src/server/driver.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 'dart:io';
 import 'dart:math';
 
 import 'package:analysis_server/src/analysis_server.dart';
-import 'package:analysis_server/src/plugin/server_plugin.dart';
-import 'package:analysis_server/src/provisional/completion/dart/completion_plugin.dart';
 import 'package:analysis_server/src/server/diagnostic_server.dart';
 import 'package:analysis_server/src/server/http_server.dart';
 import 'package:analysis_server/src/server/stdio_server.dart';
 import 'package:analysis_server/src/socket_server.dart';
 import 'package:analysis_server/starter.dart';
 import 'package:analyzer/file_system/physical_file_system.dart';
 import 'package:analyzer/instrumentation/file_instrumentation.dart';
 import 'package:analyzer/instrumentation/instrumentation.dart';
 import 'package:analyzer/plugin/resolver_provider.dart';
 import 'package:analyzer/src/context/builder.dart';
@@ skipping 328 matching lines @@
         print('');
         _printUsage(parser.parser, analytics);
         exitCode = 1;
         return null;
       }
     }
 
     //
     // Process all of the plugins so that extensions are registered.
     //
-    ServerPlugin serverPlugin = new ServerPlugin();
     List<Plugin> plugins = <Plugin>[];
     plugins.addAll(AnalysisEngine.instance.requiredPlugins);
-    plugins.add(serverPlugin);
-    plugins.add(dartCompletionPlugin);
     plugins.addAll(_userDefinedPlugins);
     ExtensionManager manager = new ExtensionManager();
     manager.processPlugins(plugins);
     linter.registerLintRules();
 
     String defaultSdkPath;
     if (results[SDK_OPTION] != null) {
       defaultSdkPath = results[SDK_OPTION];
     } else {
       // No path to the SDK was provided.
@@ skipping 36 matching lines @@
 
     //
     // Create the sockets and start listening for requests.
     //
     socketServer = new SocketServer(
         analysisServerOptions,
         new DartSdkManager(defaultSdkPath, true),
         defaultSdk,
         instrumentationService,
         diagnosticServer,
-        serverPlugin,
         fileResolverProvider,
         packageResolverProvider);
     httpServer = new HttpAnalysisServer(socketServer);
     stdioServer = new StdioAnalysisServer(socketServer);
     socketServer.userDefinedPlugins = _userDefinedPlugins;
 
     diagnosticServer.httpServer = httpServer;
     if (serve_http) {
       diagnosticServer.startOnPort(port);
     }
@@ skipping 184 matching lines @@
 
   _DiagnosticServerImpl();
 
   @override
   Future<int> getServerPort() => httpServer.serveHttp();
 
   Future startOnPort(int port) {
     return httpServer.serveHttp(port);
   }
 }