There are no users of releaseConstNonNull. We can use Ref's templated move ctor to move from releaseNonNull's Ref<T> to Ref<const T> which is how Ref<const T> are being constructed from RefPtrs now (see FetchBody::extract)
<rdar://problem/116146895>
Pull request: https://github.com/WebKit/WebKit/pull/18314
Committed 268558@main (b08052889f6e): <https://commits.webkit.org/268558@main> Reviewed commits have been landed. Closing PR #18314 and removing active labels.