DeprecatedGlobalSettings and RuntimeEnabledFeatures serve the same purpose, we don't need both.
Pull request: https://github.com/WebKit/WebKit/pull/1809
Committed 251930@main (5ddb4127ac4e): <https://commits.webkit.org/251930@main> Reviewed commits have been landed. Closing PR #1809 and removing active labels.
<rdar://problem/96097307>