Drop event listener exceptions on the floor.
Drop event listener exceptions on the floor.

We get a lot of failures from assertions that event listeners haven't
thrown exceptions. As the FIXME above these assertions suggests, we
should just drop them on the floor.

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aratang/servo,thiagopnts/servo,ConnorGBrewster/servo,rentongzhang/servo,indykish/servo,srbhklkrn/SERVOENGINE,dati91/servo,mukilan/servo,larsbergstrom/servo,nnethercote/servo,canaltinova/servo,ryancanhelpyou/servo,jlegendary/servo,SimonSapin/servo,DominoTree/servo,mattnenterprise/servo,AnthonyBroadCrawford/servo,eddyb/servo,DominoTree/servo,cbrewster/servo,j3parker/servo,pyfisch/servo,jlegendary/servo,nerith/servo,dmarcos/servo,nnethercote/servo,peterjoel/servo,karlito40/servo,karlito40/servo,zhangjunlei26/servo,chotchki/servo,bjwbell/servo,fiji-flo/servo,notriddle/servo,szeged/servo,CJ8664/servo,WriterOfAlicrow/servo,avadacatavra/servo,nick-thompson/servo,wpgallih/servo,WriterOfAlicrow/servo,mt2d2/servo,ConnorGBrewster/servo,GreenRecycleBin/servo,huonw/servo,jdramani/servo,codemac/servo,snf/servo,mbrubeck/servo,mattnenterprise/servo,jdramani/servo,zhangjunlei26/servo,anthgur/servo,srbhklkrn/SERVOENGINE,tempbottle/servo,akosel/servo,tempbottle/servo,GreenRecycleBin/servo,mattnenterprise/servo,mt2d2/servo,Shraddha512/servo,dhananjay92/servo,tschneidereit/servo,bfrohs/servo,michaelwu/servo,indykish/servo,dhananjay92/servo,saneyuki/servo,hyowon/servo,wartman4404/servo,A-deLuna/servo,wpgallih/servo,splav/servo,GyrosOfWar/servo,RenaudParis/servo,michaelwu/servo,luniv/servo,KiChjang/servo,thiagopnts/servo,KiChjang/servo,Adenilson/prototype-viewing-distance,dvberkel/servo,jdramani/servo,youprofit/servo,g-k/servo,zentner-kyle/servo,mukilan/servo,paulrouget/servo,nick-thompson/servo,rnestler/servo,tempbottle/servo,snf/servo,GreenRecycleBin/servo,DominoTree/servo,peterjoel/servo,boghison/servo,pyfisch/servo,youprofit/servo,peterjoel/servo,mbrubeck/servo,brendandahl/servo,kindersung/servo,walac/servo,WriterOfAlicrow/servo,dati91/servo,splav/servo,kindersung/servo,cbrewster/servo,aweinstock314/servo,dmarcos/servo,mdibaiee/servo,meh/servo,wpgallih/servo,KiChjang/servo,luniv/servo,rixrix/servo,mdibaiee/servo,AnthonyBroadCrawford/servo,larsbergstrom/servo,larsbergstrom/servo,anthgur/servo,bjwbell/servo,dsandeephegde/servo,brendandahl/servo,deokjinkim/servo,emilio/servo,codemac/servo,dsandeephegde/servo,CJ8664/servo,codemac/servo,rentongzhang/servo,AnthonyBroadCrawford/servo,juzer10/servo