We should replace master.MasterShellCommand with master.MasterShellCommandNewStyle everwhere in ews-build.webkit.org. Old-style commands are officially deprecated and will be removed in a future version of buildbot.
<rdar://problem/109421681>
Pull request: https://github.com/WebKit/WebKit/pull/13937
Committed 267110@main (d74568eeedcb): <https://commits.webkit.org/267110@main> Reviewed commits have been landed. Closing PR #13937 and removing active labels.