`Clear-Site-Data: "cache"` HTTP header should clear navigation snapshots.
Pull request: https://github.com/WebKit/WebKit/pull/9663
Committed 259936@main (17d23e2ec51d): <https://commits.webkit.org/259936@main> Reviewed commits have been landed. Closing PR #9663 and removing active labels.
<rdar://problem/105113854>