Steps to reproduce the problem:
1. Try to send  u2f register request (see https://raw.githubusercontent.com/google/u2f-ref-code/master/u2f-gae-demo/war/js/u2f-api.js)
2. Code executes document.location = "intent:#Intent;action=com.google.android.apps.authenticator.AUTHENTICATE;S.request=...;end"

What is the expected behavior?
onbeforeunload event is not fired

What went wrong?
onbeforeunload event is fired event though the URL didn't actually change

Did this work before? Yes 

Does this work in other browsers? Yes

Chrome version: 71.0.3578.99  Channel: stable
OS Version: 9
Flash Version: 

Also tested in Dev (73.0.3667.2).
Found in Tutanota login process (mail.tutanota.com).