如何在不丢失应用数据的情况下删除Crosswalk？

I'd like to remove Crosswalk 23 from my Cordova project. My problem is, that I'm storing data in an IndexedDB for offline work and I don't want to our customers to re-sync all the data after updating the app. Is there a safe way to transfer the data to the native Android webview during the first start after updating to the new version?I'd like to remove Crosswalk 23 from my Cordova