It isn't used any more, and it requires legacy header storage on API::WebsitePolicies
Pull request: https://github.com/WebKit/WebKit/pull/3124
Committed 253245@main (21027fde1383): <https://commits.webkit.org/253245@main> Reviewed commits have been landed. Closing PR #3124 and removing active labels.
<rdar://problem/98352819>