'Rename Import Prefix' refactoring.

pkg/analysis_services/lib/refactoring/refactoring.dart

Index: pkg/analysis_services/lib/refactoring/refactoring.dart
diff --git a/pkg/analysis_services/lib/refactoring/refactoring.dart b/pkg/analysis_services/lib/refactoring/refactoring.dart
index fa163a35f246a06758715cdae7cc8457250b0f2b..71bf65b3e6c20802bc4a8c2f030560cc3bc60c1c 100644
--- a/pkg/analysis_services/lib/refactoring/refactoring.dart
+++ b/pkg/analysis_services/lib/refactoring/refactoring.dart
@@ -9,6 +9,7 @@ import 'dart:async';
 import 'package:analysis_services/correction/change.dart';
 import 'package:analysis_services/correction/status.dart';
 import 'package:analysis_services/search/search_engine.dart';
+import 'package:analysis_services/src/refactoring/rename_import.dart';
 import 'package:analysis_services/src/refactoring/rename_library.dart';
 import 'package:analysis_services/src/refactoring/rename_local.dart';
 import 'package:analyzer/src/generated/element.dart';
@@ -66,6 +67,9 @@ abstract class RenameRefactoring implements Refactoring {
    * type.
    */
   factory RenameRefactoring(SearchEngine searchEngine, Element element) {
+    if (element is ImportElement) {
+      return new RenameImportRefactoringImpl(searchEngine, element);
+    }
     if (element is LibraryElement) {
       return new RenameLibraryRefactoringImpl(searchEngine, element);
     }