auto merge of #3943 : Ms2ger/servo/img_width_height, r=jdm
auto merge of #3943 : Ms2ger/servo/img_width_height, r=jdm

This fixes an intermittent failure introduced in
<https://github.com/servo/servo/pull/3929>.

AnthonyBroadCrawford/servo,szeged/servo,nick-thompson/servo,dmarcos/servo,zhangjunlei26/servo,youprofit/servo,samfoo/servo,mdibaiee/servo,CJ8664/servo,wpgallih/servo,jimberlage/servo,saratang/servo,aidanhs/servo,dati91/servo,samfoo/servo,srbhklkrn/SERVOENGINE,snf/servo,pyfisch/servo,dmarcos/servo,WriterOfAlicrow/servo,hyowon/servo,caldwell/servo,dhananjay92/servo,mt2d2/servo,boghison/servo,nerith/servo,wpgallih/servo,tempbottle/servo,pgonda/servo,sadmansk/servo,ConnorGBrewster/servo,dagnir/servo,dati91/servo,zhangjunlei26/servo,Shraddha512/servo,CJ8664/servo,A-deLuna/servo,zentner-kyle/servo,huonw/servo,mbrubeck/servo,nrc/servo,saratang/servo,thiagopnts/servo,WriterOfAlicrow/servo,tafia/servo,splav/servo,zhangjunlei26/servo,samfoo/servo,DominoTree/servo,codemac/servo,pyfisch/servo,zhangjunlei26/servo,codemac/servo,wartman4404/servo,jlegendary/servo,GyrosOfWar/servo,mukilan/servo,rentongzhang/servo,bfrohs/servo,wpgallih/servo,tschneidereit/servo,larsbergstrom/servo,jimberlage/servo,jgraham/servo,runarberg/servo,DominoTree/servo,SimonSapin/servo,mdibaiee/servo,wpgallih/servo,saneyuki/servo,splav/servo,j3parker/servo,A-deLuna/servo,dvberkel/servo,bjwbell/servo,kindersung/servo,jgraham/servo,KiChjang/servo,wpgallih/servo,mbrubeck/servo,mattnenterprise/servo,dati91/servo,tempbottle/servo,sadmansk/servo,brendandahl/servo,dhananjay92/servo,karlito40/servo,zentner-kyle/servo,saratang/servo,caldwell/servo,zhangjunlei26/servo,ruud-v-a/servo,dsandeephegde/servo,aidanhs/servo,anthgur/servo,zhangjunlei26/servo,cbrewster/servo,cbrewster/servo,zentner-kyle/servo,SimonSapin/servo,huonw/servo,codemac/servo,thiagopnts/servo,caldwell/servo,dsandeephegde/servo,chotchki/servo,fiji-flo/servo,szeged/servo,evilpie/servo,codemac/servo,rixrix/servo,dagnir/servo,deokjinkim/servo,rentongzhang/servo,deokjinkim/servo,meh/servo,luniv/servo,mbrubeck/servo,AnthonyBroadCrawford/servo,aweinstock314/servo,bjwbell/servo,evilpie/servo,ryancanhelpyou/servo,jgraham/servo,indykish/servo,chotchki/servo,eddyb/servo,nrc/servo,mdibaiee/servo,pyfisch/servo,peterjoel/servo,SimonSapin/servo,Adenilson/prototype-viewing-distance,splav/servo,nerith/servo,splav/servo,caldwell/servo,emilio/servo,rnestler/servo,dmarcos/servo,aidanhs/servo,huonw/servo,kindersung/servo,emilio/servo,karlito40/servo,mukilan/servo,zentner-kyle/servo,DominoTree/servo,jlegendary/servo,fiji-flo/servo,jimberlage/servo,chotchki/servo,WriterOfAlicrow/servo,mdibaiee/servo,pgonda/servo,rnestler/servo,larsbergstrom/servo,anthgur/servo,ryancanhelpyou/servo,SimonSapin/servo,bfrohs/servo,Shraddha512/servo,luniv/servo,srbhklkrn/SERVOENGINE,upsuper/servo,mt2d2/servo,pyfisch/servo,snf/servo,sadmansk/servo,pyecs/servo,CJ8664/servo,runarberg/servo,saratang/servo,steveklabnik/servo,notriddle/servo,bjwbell/servo,ruud-v-a/servo,michaelwu/servo,brendandahl/servo,j3parker/servo,indykish/servo,notriddle/servo,thiagopnts/servo,huonw/servo,akosel/servo,wartman4404/servo,s142857/servo,saneyuki/servo,deokjinkim/servo,DominoTree/servo,dhananjay92/servo,szeged/servo,steveklabnik/servo,youprofit/servo,meh/servo,snf/servo,paulrouget/servo,larsbergstrom/servo,canaltinova/servo,peterjoel/servo,boghison/servo,cbrewster/servo,nnethercote/servo,dsandeephegde/servo,dmarcos/servo,Adenilson/prototype-viewing-distance,nerith/servo,mattnenterprise/servo,thiagopnts/servo,dvberkel/servo,mdibaiee/servo,RenaudParis/servo,akosel/servo,pyecs/servo,evilpie/servo,fiji-flo/servo,kindersung/servo,pgonda/servo,splav/servo,j3parker/servo,indykish/servo,larsbergstrom/servo,GreenRecycleBin/servo,froydnj/servo,GyrosOfWar/servo,dagnir/servo,peterjoel/servo,dsandeephegde/servo,splav/servo,splav/servo,AnthonyBroadCrawford/servo,mt2d2/servo,deokjinkim/servo,evilpie/servo,dati91/servo,ConnorGBrewster/servo,larsbergstrom/servo,mt2d2/servo,KiChjang/servo,canaltinova/servo,chotchki/servo,mattnenterprise/servo,wpgallih/servo,aidanhs/servo,sadmansk/servo,dagnir/servo,dmarcos/servo,notriddle/servo,shrenikgala/servo,nnethercote/servo,wpgallih/servo,RenaudParis/servo,steveklabnik/servo,ruud-v-a/servo,jgraham/servo,nick-thompson/servo,caldwell/servo,runarberg/servo,pyfisch/servo,deokjinkim/servo,wpgallih/servo,mt2d2/servo,akosel/servo,RenaudParis/servo,boghison/servo,dvberkel/servo,aweinstock314/servo,notriddle/servo,karlito40/servo,peterjoel/servo,walac/servo,upsuper/servo,aweinstock314/servo,nnethercote/servo,GreenRecycleBin/servo,hyowon/servo,codemac/servo,nick-thompson/servo,rixrix/servo,Shraddha512/servo,meh/servo,g-k/servo,notriddle/servo,walac/servo,mbrubeck/servo,jimberlage/servo,Shraddha512/servo,notriddle/servo,rixrix/servo,saratang/servo,KiChjang/servo,Shraddha512/servo,indykish/servo,bfrohs/servo,emilio/servo,youprofit/servo,DominoTree/servo,avadacatavra/servo,dhananjay92/servo,bfrohs/servo,codemac/servo,emilio/servo,peterjoel/servo,avadacatavra/servo,nrc/servo,evilpie/servo,A-deLuna/servo,j3parker/servo,aidanhs/servo,tafia/servo,g-k/servo,dmarcos/servo,tschneidereit/servo,kindersung/servo,mattnenterprise/servo,emilio/servo,tschneidereit/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