QTP/UFT Support Tip: QTP/UFT Does Not Recognize Popup Dialogs in Chrome Browser
This behavior has been reported in several tickets: "Popup Dialogs from a Web application are identified as WinObject in Chrome. It works fine in Internet Explorer (IE) or Firefox (FF)".
Note: the sample above was taken from the following link to reproduce the issue http://www.w3schools.com/js/tryit.asp?filename=tryjs_alert
This is a known issue and below article has been created, it contains Enhancement Request to fix the limitation and workarounds. I recommend you subscribe to the email notification to get an update about the actual status.
Hope this helps.
HP | Unified Functional Testing Engineer
If you find this or any post resolves your issue, please be sure to mark it as an accepted solution and give KUDOS to the author for their assistance".