Remove UriReferencedElement with its uri/uriOffset/uriEnd properties.

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

Index: pkg/analysis_server/lib/src/services/refactoring/refactoring.dart
diff --git a/pkg/analysis_server/lib/src/services/refactoring/refactoring.dart b/pkg/analysis_server/lib/src/services/refactoring/refactoring.dart
index 6818300ed27962db139d23be1131a7926deccc1c..1e51c6fd5268ac228eaa996a8f342c3055f83595 100644
--- a/pkg/analysis_server/lib/src/services/refactoring/refactoring.dart
+++ b/pkg/analysis_server/lib/src/services/refactoring/refactoring.dart
@@ -363,7 +363,8 @@ abstract class RenameRefactoring implements Refactoring {
           searchEngine, astProvider, element);
     }
     if (element is ImportElement) {
-      return new RenameImportRefactoringImpl(searchEngine, element);
+      return new RenameImportRefactoringImpl(
+          searchEngine, astProvider, element);
     }
     if (element is LabelElement) {
       return new RenameLabelRefactoringImpl(searchEngine, element);