Unreviewed build fix for r262982 since the delegate method expects an NSHTTPURLResponse.
<rdar://problem/107879504>
Pull request: https://github.com/WebKit/WebKit/pull/12756
Committed 262986@main (2c5325e6b4b7): <https://commits.webkit.org/262986@main> Reviewed commits have been landed. Closing PR #12756 and removing active labels.