Remove uses of the old plugin model from the analysis server

pkg/analysis_server/lib/src/server/driver.dart

Index: pkg/analysis_server/lib/src/server/driver.dart
diff --git a/pkg/analysis_server/lib/src/server/driver.dart b/pkg/analysis_server/lib/src/server/driver.dart
index 8691f9b0ac11938bf29c255bc41560116445f740..1067ef5c290173dbbaefa869730e846b3b224cb8 100644
--- a/pkg/analysis_server/lib/src/server/driver.dart
+++ b/pkg/analysis_server/lib/src/server/driver.dart
@@ -7,8 +7,6 @@ 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';
@@ -357,11 +355,8 @@ class Driver implements ServerStarter {
     //
     // 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);
@@ -418,7 +413,6 @@ class Driver implements ServerStarter {
         defaultSdk,
         instrumentationService,
         diagnosticServer,
-        serverPlugin,
         fileResolverProvider,
         packageResolverProvider);
     httpServer = new HttpAnalysisServer(socketServer);