Now that HAVE_PRIVACY_PROXY_FAIL_CLOSED_FOR_UNREACHABLE_HOSTS is enabled in the public build, there is a duplicating declaration to remove.
<rdar://problem/115743300>
Committed 268153@main (4ffc2323b1b3): <https://commits.webkit.org/268153@main> Reviewed commits have been landed. Closing PR #17933 and removing active labels.