This variable is not used, and clang cannot tell due to all the fancy smart pointer and function calls around it. This variable has not had any use since 9 years ago anyway.
Pull request: https://github.com/WebKit/WebKit/pull/10370
Committed 260570@main (9b1aa5aeec5d): <https://commits.webkit.org/260570@main> Reviewed commits have been landed. Closing PR #10370 and removing active labels.
<rdar://problem/105696780>