Remove shadow related SVG functionality since it was added for the removed property -webkit-svg-shadow (see 238071).
Created attachment 435080 [details] Patch
Created attachment 435081 [details] Patch
Created attachment 435085 [details] Patch
<rdar://problem/81911810>
Committed r281064 (240525@main): <https://commits.webkit.org/240525@main> All reviewed patches have been landed. Closing bug and clearing flags on attachment 435085 [details].