Fix for 'Convert Method to Getter' when multiple files are changed.

pkg/analysis_server/lib/src/services/refactoring/convert_method_to_getter.dart

Index: pkg/analysis_server/lib/src/services/refactoring/convert_method_to_getter.dart
diff --git a/pkg/analysis_server/lib/src/services/refactoring/convert_method_to_getter.dart b/pkg/analysis_server/lib/src/services/refactoring/convert_method_to_getter.dart
index 6b63f7692fe243490679bfa642e9df8f83ae55a7..55cc6a7fab7ef551fb7c964d48b9eddc6b270d4f 100644
--- a/pkg/analysis_server/lib/src/services/refactoring/convert_method_to_getter.dart
+++ b/pkg/analysis_server/lib/src/services/refactoring/convert_method_to_getter.dart
@@ -132,7 +132,7 @@ class ConvertMethodToGetterRefactoringImpl extends RefactoringImpl implements
         if (invocation != null) {
           SourceRange range = rangeEndEnd(refRange, invocation);
           SourceEdit edit = newSourceEdit_range(range, '');
-          doSourceChange_addElementEdit(change, element, edit);
+          doSourceChange_addElementEdit(change, refElement, edit);
         }
       }
     });