Remove more references to the old plugin system

pkg/analysis_server/lib/src/status/diagnostics.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:convert';
 import 'dart:io';
 
 import 'package:analysis_server/protocol/protocol_generated.dart';
 import 'package:analysis_server/src/analysis_server.dart';
@@ skipping 16 matching lines @@
 import 'package:analyzer/src/dart/analysis/driver.dart';
 import 'package:analyzer/src/dart/analysis/file_state.dart';
 import 'package:analyzer/src/dart/sdk/sdk.dart';
 import 'package:analyzer/src/generated/engine.dart' hide AnalysisResult;
 import 'package:analyzer/src/generated/sdk.dart';
 import 'package:analyzer/src/generated/source.dart';
 import 'package:analyzer/src/generated/utilities_general.dart';
 import 'package:analyzer/src/lint/linter.dart';
 import 'package:analyzer/src/lint/registry.dart';
 import 'package:analyzer/src/services/lint.dart';
-import 'package:plugin/plugin.dart';
 
 final String kCustomCss = '''
 .lead, .page-title+.markdown-body>p:first-child {
   margin-bottom: 30px;
   font-size: 20px;
   font-weight: 300;
   color: #555;
 }
 
 .container {
@@ skipping 959 matching lines @@
     h3('Analysis plugins');
     List<PluginInfo> analysisPlugins = server.pluginManager.plugins;
 
     if (analysisPlugins.isEmpty) {
       blankslate('No analysis plugins active.');
     } else {
       ul(analysisPlugins, (PluginInfo p) {
         buf.writeln('${p.data.name} ${p.pluginId} (${p.data.version})');
       });
     }
-
-    h3('Analyzer plugins');
-    void writePlugin(Plugin plugin) {
-      buf.write(plugin.uniqueIdentifier);
-      buf.write(' (');
-      buf.write(plugin.runtimeType);
-      buf.write(')');
-    }
-
-    List<Plugin> plugins = [
-      AnalysisEngine.instance.enginePlugin,
-    ];
-    plugins.addAll(server.userDefinedPlugins);
-    ul(plugins, writePlugin);
   }
 }
 
 class ProfilePage extends DiagnosticPageWithNav {
   ProfilePage(DiagnosticsSite site)
       : super(site, 'profile', 'Profiling Info',
             description: 'Profiling performance tag data.');
 
   @override
   void generateContent(Map<String, String> params) {
@@ skipping 157 matching lines @@
     h3('Execution domain');
     ul(ExecutionService.VALUES, (item) {
       if (domain.onFileAnalyzed != null) {
         buf.write('$item (has subscriptions)');
       } else {
         buf.write('$item (no subscriptions)');
       }
     });
   }
 }