Note that the Referer header still won't be sent if the download is triggered
via an anchor element with the 'download' attribute: crbug.com/455987 .

Task-number: QTBUG-61354
Change-Id: I5af971af916b2190756e3e58f19736072a213922
Reviewed-by: Michal Klocek <michal.klocek@qt.io>