This class has been unused since the removal of WKLegacyPDFView.
Pull request: https://github.com/WebKit/WebKit/pull/13075
Committed 263288@main (9ebd9614acf4): <https://commits.webkit.org/263288@main> Reviewed commits have been landed. Closing PR #13075 and removing active labels.
<rdar://problem/108415452>