It's unused since 254947@main. We need a solution for WebGL ANGLE implementation, but in the meantime this is dead code we can just remove.
Pull request: https://github.com/WebKit/WebKit/pull/14580
Committed 264788@main (ae6be25d41f9): <https://commits.webkit.org/264788@main> Reviewed commits have been landed. Closing PR #14580 and removing active labels.