Move SourceReference, extract duplicate code.

pkg/analysis_server/lib/src/services/refactoring/rename_local.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_local;
 
 import 'dart:async';
 
 import 'package:analysis_server/src/protocol.dart' hide Element;
 import 'package:analysis_server/src/services/correction/status.dart';
@@ skipping 53 matching lines @@
       }
     } else if (element is ParameterElement) {
       result.addStatus(validateParameterName(newName));
     } else if (element is FunctionElement) {
       result.addStatus(validateFunctionName(newName));
     }
     return result;
   }
 
   @override
-  Future<SourceChange> createChange() {
-    SourceChange change = new SourceChange(refactoringName);
-    // update declaration
-    addDeclarationEdit(change, element);
-    // update references
-    return searchEngine.searchReferences(element).then((refMatches) {
-      List<SourceReference> references = getSourceReferences(refMatches);
-      for (SourceReference reference in references) {
-        addReferenceEdit(change, reference);
-      }
-      return change;
-    });
+  Future fillChange() {
+    addDeclarationEdit(element);
+    return searchEngine.searchReferences(element).then(addReferenceEdits);
   }
 
   void _analyzePossibleConflicts_inLibrary(RefactoringStatus result,
       Source unitSource, Source librarySource) {
     // prepare resolved unit
     CompilationUnit unit = null;
     try {
       unit = context.resolveCompilationUnit2(unitSource, librarySource);
     } catch (e) {
     }
@@ skipping 46 matching lines @@
                 '"$nameElementSourceName" will be shadowed by renamed $refKind.';
         result.addError(message, new Location.fromNode(node));
       }
     }
   }
 
   static bool _isNamedExpressionName(SimpleIdentifier node) {
     return node.parent is Label && node.parent.parent is NamedExpression;
   }
 }