[USS] Add function for update storage key for processor

components/sync/model_impl/shared_model_type_processor.h

Index: components/sync/model_impl/shared_model_type_processor.h
diff --git a/components/sync/model_impl/shared_model_type_processor.h b/components/sync/model_impl/shared_model_type_processor.h
index cfc461d76d2666f5a273a1cbdad19334b341d841..62c136fa5b786369807c7c85b6f2ad9f4d8626fc 100644
--- a/components/sync/model_impl/shared_model_type_processor.h
+++ b/components/sync/model_impl/shared_model_type_processor.h
@@ -57,6 +57,9 @@ class SharedModelTypeProcessor : public ModelTypeProcessor,
            MetadataChangeList* metadata_change_list) override;
   void Delete(const std::string& storage_key,
               MetadataChangeList* metadata_change_list) override;
+  void UpdateStorageKey(const std::string& old_storage_key,
+                        const std::string& new_storage_key,
+                        MetadataChangeList* metadata_change_list) override;
   void ModelReadyToSync(std::unique_ptr<MetadataBatch> batch) override;
   void OnSyncStarting(const ModelErrorHandler& error_handler,
                       const StartCallback& callback) override;