TestWebKitAPI: Remove *.vsprops files that were used for AppleWin
Pull request: https://github.com/WebKit/WebKit/pull/10541
Committed 260704@main (1aebda6ba18b): <https://commits.webkit.org/260704@main> Reviewed commits have been landed. Closing PR #10541 and removing active labels.
<rdar://problem/105801495>