WinCairo WK1 was removed. So CurlDownload[.h|.cpp] is no longer needed.
Pull request: https://github.com/WebKit/WebKit/pull/14465
Committed 264660@main (e28ed6a22681): <https://commits.webkit.org/264660@main> Reviewed commits have been landed. Closing PR #14465 and removing active labels.
<rdar://problem/109990233>