Unify the server and plugin versions of the generators

pkg/analysis_server/test/protocol_test.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.
 
-library test.protocol;
-
 import 'dart:convert';
 
-import 'package:analysis_server/plugin/protocol/protocol.dart';
+import 'package:analysis_server/protocol/protocol.dart';
+import 'package:analysis_server/protocol/protocol_generated.dart';
 import 'package:analysis_server/src/constants.dart';
 import 'package:analysis_server/src/protocol/protocol_internal.dart';
 import 'package:test/test.dart';
 import 'package:test_reflective_loader/test_reflective_loader.dart';
 
 main() {
   defineReflectiveSuite(() {
     defineReflectiveTests(NotificationTest);
     defineReflectiveTests(RequestTest);
     defineReflectiveTests(RequestErrorTest);
@@ skipping 244 matching lines @@
   void test_fromJson_withResult() {
     Response original = new Response('myId', result: {'foo': 'bar'});
     Response response = new Response.fromJson(original.toJson());
     expect(response.id, equals('myId'));
     Map<String, Object> result =
         response.toJson()['result'] as Map<String, Object>;
     expect(result.length, equals(1));
     expect(result['foo'], equals('bar'));
   }
 }