The testing code in PixelDumpSupportCG.h/PixelDumpSupportCG.cpp used to build on Windows. We don't need this support anymore, and should remove it.
Pull request: https://github.com/WebKit/WebKit/pull/10060
Committed 260265@main (9c0ec4ce7947): <https://commits.webkit.org/260265@main> Reviewed commits have been landed. Closing PR #10060 and removing active labels.
<rdar://problem/105457793>