ARQL doesn't get told when a download fails. Add this using their new SPI.
rdar://104039022
Pull request: https://github.com/WebKit/WebKit/pull/11959
Committed 263479@main (345d5c9e9dae): <https://commits.webkit.org/263479@main> Reviewed commits have been landed. Closing PR #11959 and removing active labels.