Unify the server and plugin versions of the generators

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/plugin/protocol/protocol.dart'
+import 'package:analysis_server/protocol/protocol_generated.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 435 matching lines @@
         element.getAncestor((e) => e is CompilationUnitElement)
             as CompilationUnitElement;
     CompilationUnit unit = _map[unitElement];
     if (unit == null) {
       unit = await _astProvider.getResolvedUnitForElement(element);
       _map[unitElement] = unit;
     }
     return unit;
   }
 }