style: Refactor overflow fixup to account for overflow: clip.
style: Refactor overflow fixup to account for overflow: clip.

This is the missing piece to make the remaining contain tests not assert on
Gecko.

sadmansk/servo,sadmansk/servo,SimonSapin/servo,dsandeephegde/servo,sadmansk/servo,dati91/servo,cbrewster/servo,emilio/servo,paulrouget/servo,SimonSapin/servo,dsandeephegde/servo,cbrewster/servo,eddyb/servo,dsandeephegde/servo,KiChjang/servo,cbrewster/servo,emilio/servo,DominoTree/servo,larsbergstrom/servo,paulrouget/servo,upsuper/servo,ConnorGBrewster/servo,mbrubeck/servo,eddyb/servo,anthgur/servo,avadacatavra/servo,jimberlage/servo,jimberlage/servo,upsuper/servo,thiagopnts/servo,DominoTree/servo,avadacatavra/servo,peterjoel/servo,ConnorGBrewster/servo,szeged/servo,larsbergstrom/servo,cbrewster/servo,splav/servo,mattnenterprise/servo,mbrubeck/servo,mattnenterprise/servo,splav/servo,canaltinova/servo,saneyuki/servo,szeged/servo,KiChjang/servo,thiagopnts/servo,mbrubeck/servo,fiji-flo/servo,CJ8664/servo,anthgur/servo,jimberlage/servo,avadacatavra/servo,emilio/servo,canaltinova/servo,pyfisch/servo,upsuper/servo,mbrubeck/servo,saneyuki/servo,szeged/servo,saneyuki/servo,DominoTree/servo,pyfisch/servo,ConnorGBrewster/servo,CJ8664/servo,avadacatavra/servo,canaltinova/servo,thiagopnts/servo,rnestler/servo,nnethercote/servo,dati91/servo,paulrouget/servo,anthgur/servo,DominoTree/servo,eddyb/servo,mbrubeck/servo,thiagopnts/servo,sadmansk/servo,saneyuki/servo,SimonSapin/servo,szeged/servo,pyfisch/servo,szeged/servo,rnestler/servo,jimberlage/servo,dati91/servo,szeged/servo,jimberlage/servo,splav/servo,peterjoel/servo,avadacatavra/servo,upsuper/servo,upsuper/servo,SimonSapin/servo,KiChjang/servo,KiChjang/servo,eddyb/servo,anthgur/servo,notriddle/servo,splav/servo,splav/servo,KiChjang/servo,szeged/servo,notriddle/servo,DominoTree/servo,fiji-flo/servo,thiagopnts/servo,fiji-flo/servo,jimberlage/servo,larsbergstrom/servo,upsuper/servo,rnestler/servo,KiChjang/servo,fiji-flo/servo,emilio/servo,rnestler/servo,paulrouget/servo,upsuper/servo,dsandeephegde/servo,larsbergstrom/servo,nnethercote/servo,saneyuki/servo,pyfisch/servo,peterjoel/servo,szeged/servo,paulrouget/servo,notriddle/servo,splav/servo,CJ8664/servo,splav/servo,paulrouget/servo,peterjoel/servo,nnethercote/servo,larsbergstrom/servo,paulrouget/servo,DominoTree/servo,saneyuki/servo,anthgur/servo,upsuper/servo,sadmansk/servo,emilio/servo,DominoTree/servo,pyfisch/servo,nnethercote/servo,fiji-flo/servo,SimonSapin/servo,pyfisch/servo,fiji-flo/servo,larsbergstrom/servo,SimonSapin/servo,splav/servo,CJ8664/servo,nnethercote/servo,nnethercote/servo,nnethercote/servo,paulrouget/servo,eddyb/servo,emilio/servo,splav/servo,sadmansk/servo,dsandeephegde/servo,rnestler/servo,dsandeephegde/servo,dsandeephegde/servo,larsbergstrom/servo,saneyuki/servo,canaltinova/servo,notriddle/servo,jimberlage/servo,thiagopnts/servo,fiji-flo/servo,peterjoel/servo,SimonSapin/servo,rnestler/servo,larsbergstrom/servo,avadacatavra/servo,pyfisch/servo,cbrewster/servo,ConnorGBrewster/servo,eddyb/servo,KiChjang/servo,szeged/servo,DominoTree/servo,mattnenterprise/servo,dati91/servo,anthgur/servo,saneyuki/servo,paulrouget/servo,pyfisch/servo,notriddle/servo,pyfisch/servo,mattnenterprise/servo,emilio/servo,mattnenterprise/servo,emilio/servo,jimberlage/servo,cbrewster/servo,thiagopnts/servo,anthgur/servo,notriddle/servo,rnestler/servo,KiChjang/servo,peterjoel/servo,larsbergstrom/servo,mbrubeck/servo,anthgur/servo,dati91/servo,KiChjang/servo,avadacatavra/servo,sadmansk/servo,nnethercote/servo,KiChjang/servo,CJ8664/servo,dati91/servo,cbrewster/servo,mattnenterprise/servo,notriddle/servo,fiji-flo/servo,peterjoel/servo,canaltinova/servo,canaltinova/servo,DominoTree/servo,nnethercote/servo,canaltinova/servo,canaltinova/servo,DominoTree/servo,CJ8664/servo,notriddle/servo,nnethercote/servo,ConnorGBrewster/servo,SimonSapin/servo,saneyuki/servo,dati91/servo,larsbergstrom/servo,dati91/servo,saneyuki/servo,notriddle/servo,CJ8664/servo,ConnorGBrewster/servo,ConnorGBrewster/servo,notriddle/servo,mbrubeck/servo,CJ8664/servo,emilio/servo,avadacatavra/servo,paulrouget/servo,eddyb/servo,cbrewster/servo,pyfisch/servo,rnestler/servo,splav/servo,eddyb/servo,mattnenterprise/servo,mbrubeck/servo,jimberlage/servo,thiagopnts/servo,peterjoel/servo,emilio/servo,peterjoel/servo,ConnorGBrewster/servo,dsandeephegde/servo,peterjoel/servo,sadmansk/servo,mattnenterprise/servo,szeged/servo