OMG !!
Finally I found out it.
To get the Redirected URL I give the URL to an InAppBrowser. My problem was how to open the browser window in hidden mode..!! The latest Cordova docs explains about it. I was referring the old docs. That's why I didn't get the answer. The Solution I found out is this: when open InAppBrowser open it in hidden mode..! That's all..!!
var ref = window.open(authorize_url, '_blank', 'location=no,hidden=yes');
This hidden=yes
solved my problem.