Move SourceReference, extract duplicate code.

pkg/analysis_server/lib/src/services/refactoring/move_file.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.move_file;
 
 import 'dart:async';
 
 import 'package:analysis_server/src/protocol.dart' hide Element;
 import 'package:analysis_server/src/services/correction/status.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/search_engine.dart';
 import 'package:analyzer/src/generated/element.dart';
 import 'package:analyzer/src/generated/engine.dart';
 import 'package:analyzer/src/generated/source.dart';
 import 'package:path/path.dart' as pathos;
 
 
 /**
  * [ExtractLocalRefactoring] implementation.
  */
@@ skipping 45 matching lines @@
           newLibraryDir = pathos.dirname(newFile);
           _updateUriReferences(library.imports);
           _updateUriReferences(library.exports);
           _updateUriReferences(library.parts);
         }
         // update reference to the unit
         return searchEngine.searchReferences(unitElement).then((matches) {
           List<SourceReference> references = getSourceReferences(matches);
           for (SourceReference reference in references) {
             String newUri = _computeNewUri(reference);
-            SourceEdit edit = createReferenceEdit(reference, "'$newUri'");
-            change.addElementEdit(reference.element, edit);
+            reference.addEdit(change, "'$newUri'");
           }
         });
       }
     }).then((_) {
       return change;
     });
   }
 
   @override
   bool requiresPreview() => false;
@@ skipping 56 matching lines @@
       return false;
     }
     // absolute URI
     if (Uri.parse(path).isAbsolute) {
       return false;
     }
     // OK
     return true;
   }
 }