Hi Team, I think these are just general system hygeine to delete unused functions and avoid 'null' cases to confirm that there is 'scrollableArea'. So raising bug to do 'draft' PR. Thanks!
Remove: https://searchfox.org/wubkat/source/Source/WebCore/page/LocalFrameView.cpp#5638 Add ASSERT: https://searchfox.org/wubkat/source/Source/WebCore/page/LocalFrameView.cpp#5616
<rdar://problem/112346898>