Deprecate the generated AST library and clean up imports

pkg/analysis_server/lib/src/services/refactoring/rename_class_member.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.rename_class_member;
 
 import 'dart:async';
 
 import 'package:analysis_server/src/protocol_server.dart'
     hide Element, ElementKind;
 import 'package:analysis_server/src/services/correction/status.dart';
 import 'package:analysis_server/src/services/correction/util.dart';
 import 'package:analysis_server/src/services/refactoring/naming_conventions.dart';
 import 'package:analysis_server/src/services/refactoring/refactoring.dart';
 import 'package:analysis_server/src/services/refactoring/refactoring_internal.dart';
 import 'package:analysis_server/src/services/refactoring/rename.dart';
 import 'package:analysis_server/src/services/search/hierarchy.dart';
 import 'package:analysis_server/src/services/search/search_engine.dart';
+import 'package:analyzer/dart/ast/ast.dart' show Identifier;
 import 'package:analyzer/dart/element/element.dart';
-import 'package:analyzer/src/generated/ast.dart' show Identifier;
 import 'package:analyzer/src/generated/java_core.dart';
 
 /**
  * Checks if creating a method with the given [name] in [classElement] will
  * cause any conflicts.
  */
 Future<RefactoringStatus> validateCreateMethod(
     SearchEngine searchEngine, ClassElement classElement, String name) {
   return new _ClassMemberValidator.forCreate(searchEngine, classElement, name)
       .validate();
@@ skipping 277 matching lines @@
     }
   }
 }
 
 class _MatchShadowedByLocal {
   final SearchMatch match;
   final LocalElement localElement;
 
   _MatchShadowedByLocal(this.match, this.localElement);
 }