Remove uses of the old plugin model from the analysis server

pkg/analysis_server/test/analysis_server_test.dart

Index: pkg/analysis_server/test/analysis_server_test.dart
diff --git a/pkg/analysis_server/test/analysis_server_test.dart b/pkg/analysis_server/test/analysis_server_test.dart
index a79dea602ee176ec8c0ac0946cbbdadcd6dcd5ee..3812974eb1a395c59387619953d1268d89d04fbc 100644
--- a/pkg/analysis_server/test/analysis_server_test.dart
+++ b/pkg/analysis_server/test/analysis_server_test.dart
@@ -9,7 +9,6 @@ import 'package:analysis_server/protocol/protocol_constants.dart';
 import 'package:analysis_server/protocol/protocol_generated.dart';
 import 'package:analysis_server/src/analysis_server.dart';
 import 'package:analysis_server/src/domain_server.dart';
-import 'package:analysis_server/src/plugin/server_plugin.dart';
 import 'package:analyzer/file_system/file_system.dart';
 import 'package:analyzer/file_system/memory_file_system.dart';
 import 'package:analyzer/instrumentation/instrumentation.dart';
@@ -86,18 +85,16 @@ class AnalysisServerTest {
     }
   }
 
-  void processRequiredPlugins(ServerPlugin serverPlugin) {
+  void processRequiredPlugins() {
     List<Plugin> plugins = <Plugin>[];
     plugins.addAll(AnalysisEngine.instance.requiredPlugins);
-    plugins.add(serverPlugin);
 
     ExtensionManager manager = new ExtensionManager();
     manager.processPlugins(plugins);
   }
 
   void setUp() {
-    ServerPlugin serverPlugin = new ServerPlugin();
-    processRequiredPlugins(serverPlugin);
+    processRequiredPlugins();
     channel = new MockServerChannel();
     resourceProvider = new MemoryResourceProvider();
     // Create an SDK in the mock file system.
@@ -107,7 +104,6 @@ class AnalysisServerTest {
         channel,
         resourceProvider,
         packageMapProvider,
-        serverPlugin,
         new AnalysisServerOptions(),
         new DartSdkManager('/', false),
         InstrumentationService.NULL_SERVICE);