We should replace shell.ShellCommand with shell.ShellCommandNewStyle everywhere in build.webkit.org. Old-style shell-commands are officially deprecated and will be removed in a future version of buildbot.
<rdar://problem/109367941>
Pull request: https://github.com/WebKit/WebKit/pull/13891
Committed 264202@main (81e4e7cf4e57): <https://commits.webkit.org/264202@main> Reviewed commits have been landed. Closing PR #13891 and removing active labels.