Unify the server and plugin versions of the generators

pkg/analysis_server/test/services/completion/dart/type_member_contributor_test.dart

 // Copyright (c) 2015, 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.services.completion.contributor.dart.type_member;
-
 import 'dart:async';
 
-import 'package:analysis_server/plugin/protocol/protocol.dart';
+import 'package:analysis_server/protocol/protocol_generated.dart';
 import 'package:analysis_server/src/provisional/completion/dart/completion_dart.dart';
 import 'package:analysis_server/src/services/completion/dart/type_member_contributor.dart';
 import 'package:test/test.dart';
 import 'package:test_reflective_loader/test_reflective_loader.dart';
 
 import 'completion_contributor_util.dart';
 
 main() {
   defineReflectiveSuite(() {
     defineReflectiveTests(TypeMemberContributorTest);
@@ skipping 4192 matching lines @@
   bool foo(int bar, {bool boo, @required int baz}) => false;
 }
 
 void main() {new A().f^}''');
     await computeSuggestions();
 
     assertSuggestMethod('foo', 'A', 'bool',
         defaultArgListString: 'bar, baz: null');
   }
 }