Fix a broken test (TBR)

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 516 matching lines @@
   List<String> get fileGlobsToAnalyze => <String>['**/*.dart'];
 
   @override
   String get name => 'minimal';
 
   @override
   String get version => '0.0.1';
 
   @override
   AnalysisHandleWatchEventsResult handleAnalysisHandleWatchEvents(
-          Map<String, Object> parameters) =>
+          AnalysisHandleWatchEventsParams parameters) =>
     new AnalysisHandleWatchEventsResult();
 
   @override
   bool isCompatibleWith(Version serverVersion) => true;
 }
 ''';
   }
 
   /**
    * Return the content to be used for the '.packages' file.
@@ skipping 55 matching lines @@
       void onNotification(Notification notification),
       {Function onError, void onDone()}) {
     fail('Unexpected invocation of listen');
   }
 
   @override
   void sendRequest(Request request) {
     sentRequests.add(request);
   }
 }