Chrome Version: M69
OS: all

What steps will reproduce the problem?
(1) Install/enable a screenreader.
(1) Go to http://rsolomakhin.github.io/autofill/ (Note: HTTP, not HTTPS)
(3) Repeatedly press tab until the "Credit card number" field in the "Credit card autofill" section is focused.
(4) Press arrow down once or twice until the warning popup is shown.

What is the expected result?

The message "Automatic credit card filling is disabled because this form does not use a secure connection" should be announced.

What happens instead?

The warning message is not announced.

The reason is that the row is not selectable. We should issue a warning/alert event instead once it happens.