Break up another large file

pkg/analysis_server/lib/src/services/correction/organize_directives.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.src.refactoring.organize_directives;
 
 import 'package:analysis_server/plugin/protocol/protocol.dart'
     hide AnalysisError, Element;
 import 'package:analysis_server/src/services/correction/strings.dart';
 import 'package:analyzer/dart/ast/ast.dart';
 import 'package:analyzer/dart/ast/token.dart';
-import 'package:analyzer/src/generated/error.dart';
+import 'package:analyzer/error/error.dart';
+import 'package:analyzer/src/error/codes.dart';
 
 /**
  * Organizer of directives in the [unit].
  */
 class DirectiveOrganizer {
   final String initialCode;
   final CompilationUnit unit;
   final List<AnalysisError> errors;
   final bool removeUnresolved;
   final bool removeUnused;
@@ skipping 219 matching lines @@
   static const PART = const _DirectivePriority('PART', 8);
 
   final String name;
   final int ordinal;
 
   const _DirectivePriority(this.name, this.ordinal);
 
   @override
   String toString() => name;
 }