Move the wire protocol support into the public API

pkg/analysis_server/lib/src/services/refactoring/refactoring.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 services.refactoring;
 
 import 'dart:async';
 
-import 'package:analysis_server/src/protocol.dart'
+import 'package:analysis_server/plugin/protocol/protocol.dart'
     show RefactoringMethodParameter, SourceChange;
 import 'package:analysis_server/src/services/correction/status.dart';
 import 'package:analysis_server/src/services/refactoring/convert_getter_to_method.dart';
 import 'package:analysis_server/src/services/refactoring/convert_method_to_getter.dart';
 import 'package:analysis_server/src/services/refactoring/extract_local.dart';
 import 'package:analysis_server/src/services/refactoring/extract_method.dart';
 import 'package:analysis_server/src/services/refactoring/inline_local.dart';
 import 'package:analysis_server/src/services/refactoring/inline_method.dart';
 import 'package:analysis_server/src/services/refactoring/move_file.dart';
 import 'package:analysis_server/src/services/refactoring/rename_class_member.dart';
@@ skipping 383 matching lines @@
    * Validates that the [newName] is a valid identifier and is appropriate for
    * the type of the [Element] being renamed.
    *
    * It does not perform all the checks (such as checking for conflicts with any
    * existing names in any of the scopes containing the current name), as many
    * of these checkes require search engine. Use [checkFinalConditions] for this
    * level of checking.
    */
   RefactoringStatus checkNewName();
 }