Remove an unused argument to CustomEvent::init_custom_event.
Remove an unused argument to CustomEvent::init_custom_event.

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