Unify the server and plugin versions of the generators

pkg/analysis_server/test/services/completion/dart/common_usage_sorter_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.dart.sorter.common;
-
 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/common_usage_sorter.dart';
 import 'package:analysis_server/src/services/completion/dart/completion_manager.dart';
 import 'package:test/test.dart';
 import 'package:test_reflective_loader/test_reflective_loader.dart';
 
 import '../../../domain_completion_util.dart';
 
 main() {
   defineReflectiveSuite(() {
@@ skipping 121 matching lines @@
     assertHasResult(CompletionSuggestionKind.INVOCATION, 'nextBool');
     assertHasResult(CompletionSuggestionKind.INVOCATION, 'nextDouble',
         relevance: DART_RELEVANCE_COMMON_USAGE - 1);
     assertHasResult(CompletionSuggestionKind.INVOCATION, 'nextInt',
         relevance: DART_RELEVANCE_COMMON_USAGE);
     assertNoResult('Random');
     assertNoResult('Object');
     assertNoResult('A');
   }
 }