Since the removal of the XSS Auditor in bug 230499, the tracking of attribute locations that HTMLSourceTracker does is unused. We can remove it.
Created attachment 451149 [details] Patch
Comment on attachment 451149 [details] Patch r=me
Committed r289356 (246944@main): <https://commits.webkit.org/246944@main> All reviewed patches have been landed. Closing bug and clearing flags on attachment 451149 [details].
<rdar://problem/88609360>