We should replace master.MasterShellCommand with master.MasterShellCommandNewStyle everwhere in build.webkit.org. Old-style commands are officially deprecated and will be removed in a future version of buildbot.
<rdar://problem/109368580>
Pull request: https://github.com/WebKit/WebKit/pull/13896
Committed 264201@main (4400d1f84564): <https://commits.webkit.org/264201@main> Reviewed commits have been landed. Closing PR #13896 and removing active labels.