dart:io | Add rename to Link

sdk/lib/_internal/lib/io_patch.dart

Index: sdk/lib/_internal/lib/io_patch.dart
diff --git a/sdk/lib/_internal/lib/io_patch.dart b/sdk/lib/_internal/lib/io_patch.dart
index 4967d9432938d47bf4943db86b3e411d84d0b12f..c56506453a4e7586438c391b9a2e23b2f4fded60 100644
--- a/sdk/lib/_internal/lib/io_patch.dart
+++ b/sdk/lib/_internal/lib/io_patch.dart
@@ -91,7 +91,10 @@ patch class _File {
     throw new UnsupportedError("File._deleteLink");
   }
   patch static _rename(String oldPath, String newPath) {
-    throw new UnsupportedError("File._delete");
+    throw new UnsupportedError("File._rename");
+  }
+  patch static _renameLink(String oldPath, String newPath) {
+    throw new UnsupportedError("File._renameLink");
   }
   patch static _lengthFromPath(String path) {
     throw new UnsupportedError("File._lengthFromPath");