auto merge of #3591 : zwarich/servo/style-properties-mut, r=jdm
auto merge of #3591 : zwarich/servo/style-properties-mut, r=jdm

I would have put the attribute on the binding itself, but that doesn't
appear to be possible yet.

paulrouget/servo,A-deLuna/servo,GreenRecycleBin/servo,indykish/servo,jdramani/servo,jdramani/servo,fiji-flo/servo,fiji-flo/servo,szeged/servo,deokjinkim/servo,AnthonyBroadCrawford/servo,anthgur/servo,jdramani/servo,karlito40/servo,CJ8664/servo,s142857/servo,Adenilson/prototype-viewing-distance,A-deLuna/servo,jdramani/servo,nick-thompson/servo,larsbergstrom/servo,dsandeephegde/servo,luniv/servo,cbrewster/servo,DominoTree/servo,dmarcos/servo,mbrubeck/servo,wpgallih/servo,eddyb/servo,nrc/servo,CJ8664/servo,luniv/servo,dhananjay92/servo,dagnir/servo,zhangjunlei26/servo,canaltinova/servo,DominoTree/servo,DominoTree/servo,vks/servo,huonw/servo,evilpie/servo,samfoo/servo,tschneidereit/servo,mattnenterprise/servo,dati91/servo,GyrosOfWar/servo,zentner-kyle/servo,WriterOfAlicrow/servo,rixrix/servo,rixrix/servo,dsandeephegde/servo,zentner-kyle/servo,GyrosOfWar/servo,WriterOfAlicrow/servo,mattnenterprise/servo,dati91/servo,emilio/servo,KiChjang/servo,ruud-v-a/servo,kindersung/servo,cbrewster/servo,SimonSapin/servo,mdibaiee/servo,juzer10/servo,upsuper/servo,j3parker/servo,brendandahl/servo,RenaudParis/servo,juzer10/servo,nerith/servo,peterjoel/servo,canaltinova/servo,dagnir/servo,fiji-flo/servo,nick-thompson/servo,notriddle/servo,dati91/servo,nrc/servo,jgraham/servo,thiagopnts/servo,wpgallih/servo,kindersung/servo,froydnj/servo,mt2d2/servo,j3parker/servo,michaelwu/servo,mattnenterprise/servo,michaelwu/servo,rnestler/servo,jlegendary/servo,boghison/servo,shrenikgala/servo,pyfisch/servo,rentongzhang/servo,aidanhs/servo,g-k/servo,splav/servo,indykish/servo,thiagopnts/servo,s142857/servo,jgraham/servo,pyfisch/servo,jimberlage/servo,thiagopnts/servo,walac/servo,pyfisch/servo,CJ8664/servo,evilpie/servo,youprofit/servo,mattnenterprise/servo,zentner-kyle/servo,echochamber/servo,canaltinova/servo,ConnorGBrewster/servo,tschneidereit/servo,mukilan/servo,ryancanhelpyou/servo,avadacatavra/servo,RenaudParis/servo,snf/servo,caldwell/servo,sadmansk/servo,echochamber/servo,snf/servo,indykish/servo,akosel/servo,juzer10/servo,saneyuki/servo,larsbergstrom/servo,fiji-flo/servo,hyowon/servo,peterjoel/servo,tempbottle/servo,rixrix/servo,nnethercote/servo,mattnenterprise/servo,GreenRecycleBin/servo,vks/servo,splav/servo,tafia/servo,youprofit/servo,samfoo/servo,pyecs/servo,srbhklkrn/SERVOENGINE,evilpie/servo,tschneidereit/servo,meh/servo,dvberkel/servo,rentongzhang/servo,codemac/servo,steveklabnik/servo,KiChjang/servo,aweinstock314/servo,srbhklkrn/SERVOENGINE,pyfisch/servo,pgonda/servo,jlegendary/servo,paulrouget/servo,SimonSapin/servo,tempbottle/servo,hyowon/servo,eddyb/servo,emilio/servo,anthgur/servo,larsbergstrom/servo,GyrosOfWar/servo,larsbergstrom/servo,jdramani/servo,nnethercote/servo,akosel/servo,saneyuki/servo,pyecs/servo,dmarcos/servo,mukilan/servo,huonw/servo,akosel/servo,steveklabnik/servo,szeged/servo,sadmansk/servo,indykish/servo,sadmansk/servo,dagnir/servo,pyecs/servo,froydnj/servo,jimberlage/servo,karlito40/servo,tempbottle/servo,rentongzhang/servo,CJ8664/servo,tschneidereit/servo,dvberkel/servo,cbrewster/servo,deokjinkim/servo,jgraham/servo,evilpie/servo,jimberlage/servo,aweinstock314/servo,meh/servo,rentongzhang/servo,dati91/servo,indykish/servo,rnestler/servo,A-deLuna/servo,kindersung/servo,splav/servo,ConnorGBrewster/servo,canaltinova/servo,akosel/servo,paulrouget/servo,ryancanhelpyou/servo,KiChjang/servo,g-k/servo,indykish/servo,szeged/servo,cbrewster/servo,aweinstock314/servo,michaelwu/servo,pyfisch/servo,Shraddha512/servo,zhangjunlei26/servo,kindersung/servo,saneyuki/servo,mt2d2/servo,luniv/servo,hyowon/servo,cbrewster/servo,avadacatavra/servo,AnthonyBroadCrawford/servo,hyowon/servo,KiChjang/servo,jgraham/servo,shrenikgala/servo,mdibaiee/servo,notriddle/servo,A-deLuna/servo,larsbergstrom/servo,sadmansk/servo,saneyuki/servo,juzer10/servo,AnthonyBroadCrawford/servo,aidanhs/servo,RenaudParis/servo,KiChjang/servo,splav/servo,eddyb/servo,szeged/servo,zhangjunlei26/servo,g-k/servo,caldwell/servo,nick-thompson/servo,KiChjang/servo,brendandahl/servo,sadmansk/servo,dsandeephegde/servo,karlito40/servo,deokjinkim/servo,karlito40/servo,mt2d2/servo,dmarcos/servo,nrc/servo,SimonSapin/servo,caldwell/servo,youprofit/servo,codemac/servo,saneyuki/servo,brendandahl/servo,meh/servo,karlito40/servo,paulrouget/servo,ConnorGBrewster/servo,wpgallih/servo,aidanhs/servo,vks/servo,emilio/servo,pyecs/servo,upsuper/servo,emilio/servo,jlegendary/servo,pyecs/servo,szeged/servo,tafia/servo,pyecs/servo,szeged/servo,paulrouget/servo,KiChjang/servo,vks/servo,CJ8664/servo,A-deLuna/servo,DominoTree/servo,brendandahl/servo,wpgallih/servo,mukilan/servo,j3parker/servo,emilio/servo,brendandahl/servo,deokjinkim/servo,wartman4404/servo,evilpie/servo,rixrix/servo,canaltinova/servo,tempbottle/servo,karlito40/servo,dvberkel/servo,indykish/servo,paulrouget/servo,snf/servo,upsuper/servo,AnthonyBroadCrawford/servo,ConnorGBrewster/servo,dhananjay92/servo,jlegendary/servo,Adenilson/prototype-viewing-distance,j3parker/servo,upsuper/servo,walac/servo,froydnj/servo,chotchki/servo,ryancanhelpyou/servo,snf/servo,GreenRecycleBin/servo,ruud-v-a/servo,mbrubeck/servo,emilio/servo,mdibaiee/servo,pgonda/servo,dhananjay92/servo,walac/servo,srbhklkrn/SERVOENGINE,saratang/servo,DominoTree/servo,walac/servo,dati91/servo,shrenikgala/servo,steveklabnik/servo,rnestler/servo,walac/servo,g-k/servo,meh/servo,steveklabnik/servo,michaelwu/servo,upsuper/servo,echochamber/servo,hyowon/servo,jimberlage/servo,bfrohs/servo,wartman4404/servo,nnethercote/servo,juzer10/servo,saneyuki/servo,GyrosOfWar/servo,zhangjunlei26/servo,GreenRecycleBin/servo,Shraddha512/servo,kindersung/servo,tempbottle/servo,mt2d2/servo,fiji-flo/servo,nnethercote/servo,dmarcos/servo,bfrohs/servo,Shraddha512/servo,ryancanhelpyou/servo,dsandeephegde/servo,s142857/servo,nrc/servo,pyfisch/servo,mattnenterprise/servo,froydnj/servo,RenaudParis/servo,saratang/servo,brendandahl/servo,youprofit/servo,rnestler/servo,peterjoel/servo,j3parker/servo,bfrohs/servo,CJ8664/servo,samfoo/servo,peterjoel/servo,rixrix/servo,splav/servo,kindersung/servo,mdibaiee/servo,notriddle/servo,Adenilson/prototype-viewing-distance,A-deLuna/servo,boghison/servo,szeged/servo,michaelwu/servo,hyowon/servo,akosel/servo,GyrosOfWar/servo,evilpie/servo,Adenilson/prototype-viewing-distance,jlegendary/servo,saneyuki/servo,samfoo/servo,CJ8664/servo,steveklabnik/servo,rnestler/servo,rentongzhang/servo,dsandeephegde/servo,szeged/servo,runarberg/servo,GyrosOfWar/servo,nerith/servo,nick-thompson/servo,rnestler/servo,dagnir/servo,eddyb/servo,aidanhs/servo,runarberg/servo,KiChjang/servo,boghison/servo,GreenRecycleBin/servo,vks/servo,dmarcos/servo,GyrosOfWar/servo,g-k/servo,larsbergstrom/servo,anthgur/servo,WriterOfAlicrow/servo,rnestler/servo,chotchki/servo,Shraddha512/servo,saneyuki/servo,AnthonyBroadCrawford/servo,bfrohs/servo,samfoo/servo,mdibaiee/servo,cbrewster/servo,snf/servo,jdramani/servo,pyfisch/servo,saratang/servo,fiji-flo/servo,notriddle/servo,brendandahl/servo,emilio/servo,upsuper/servo,j3parker/servo,akosel/servo,ruud-v-a/servo,shrenikgala/servo,pgonda/servo,canaltinova/servo,mt2d2/servo,dhananjay92/servo,dagnir/servo,notriddle/servo,nerith/servo,pyecs/servo,dsandeephegde/servo,bjwbell/servo,dati91/servo,vks/servo,RenaudParis/servo,shrenikgala/servo,samfoo/servo,szeged/servo,peterjoel/servo,wpgallih/servo,chotchki/servo,notriddle/servo,runarberg/servo,aweinstock314/servo,cbrewster/servo,karlito40/servo,caldwell/servo,notriddle/servo,dhananjay92/servo,steveklabnik/servo,thiagopnts/servo,meh/servo,pyfisch/servo,peterjoel/servo,thiagopnts/servo,splav/servo,aidanhs/servo,mt2d2/servo,upsuper/servo,GreenRecycleBin/servo,DominoTree/servo,dvberkel/servo,sadmansk/servo,srbhklkrn/SERVOENGINE,luniv/servo,fiji-flo/servo,tschneidereit/servo,jimberlage/servo,Adenilson/prototype-viewing-distance,huonw/servo,michaelwu/servo,jgraham/servo,wartman4404/servo,Shraddha512/servo,wartman4404/servo,aidanhs/servo,SimonSapin/servo,SimonSapin/servo,ruud-v-a/servo,larsbergstrom/servo,avadacatavra/servo,GreenRecycleBin/servo,peterjoel/servo,jlegendary/servo,aweinstock314/servo,szeged/servo,mbrubeck/servo,mukilan/servo,g-k/servo,dati91/servo,anthgur/servo,peterjoel/servo,samfoo/servo,youprofit/servo,ConnorGBrewster/servo,splav/servo,indykish/servo,RenaudParis/servo,nnethercote/servo,jimberlage/servo,zhangjunlei26/servo,froydnj/servo,chotchki/servo,srbhklkrn/SERVOENGINE,wpgallih/servo,bfrohs/servo,aidanhs/servo,RenaudParis/servo,jimberlage/servo,ryancanhelpyou/servo,zentner-kyle/servo,pyfisch/servo,snf/servo,evilpie/servo,youprofit/servo,mbrubeck/servo,shrenikgala/servo,akosel/servo,rnestler/servo,tafia/servo,srbhklkrn/SERVOENGINE,nrc/servo,kindersung/servo,luniv/servo,thiagopnts/servo,WriterOfAlicrow/servo,luniv/servo,jimberlage/servo,chotchki/servo,runarberg/servo,nnethercote/servo,srbhklkrn/SERVOENGINE,anthgur/servo,WriterOfAlicrow/servo,runarberg/servo,zentner-kyle/servo,A-deLuna/servo,AnthonyBroadCrawford/servo,saneyuki/servo,caldwell/servo,thiagopnts/servo,splav/servo,saneyuki/servo,upsuper/servo,emilio/servo,ryancanhelpyou/servo,ConnorGBrewster/servo,boghison/servo,deokjinkim/servo,avadacatavra/servo,rixrix/servo,Shraddha512/servo,rixrix/servo,emilio/servo,bjwbell/servo,walac/servo,runarberg/servo,mbrubeck/servo,paulrouget/servo,walac/servo,indykish/servo,wpgallih/servo,codemac/servo,wpgallih/servo,juzer10/servo,dagnir/servo,steveklabnik/servo,wartman4404/servo,deokjinkim/servo,vks/servo,zhangjunlei26/servo,s142857/servo,mdibaiee/servo,mt2d2/servo,mbrubeck/servo,aweinstock314/servo,avadacatavra/servo,sadmansk/servo,SimonSapin/servo,notriddle/servo,wpgallih/servo,AnthonyBroadCrawford/servo,eddyb/servo,larsbergstrom/servo,canaltinova/servo,meh/servo,mattnenterprise/servo,tafia/servo,bjwbell/servo,avadacatavra/servo,echochamber/servo,nrc/servo,codemac/servo,sadmansk/servo,zhangjunlei26/servo,DominoTree/servo,anthgur/servo,mukilan/servo,rentongzhang/servo,ryancanhelpyou/servo,zentner-kyle/servo,hyowon/servo,paulrouget/servo,evilpie/servo,luniv/servo,pgonda/servo,SimonSapin/servo,GreenRecycleBin/servo,nnethercote/servo,DominoTree/servo,echochamber/servo,emilio/servo,g-k/servo,zhangjunlei26/servo,nick-thompson/servo,avadacatavra/servo,snf/servo,paulrouget/servo,nick-thompson/servo,WriterOfAlicrow/servo,meh/servo,mbrubeck/servo,codemac/servo,mukilan/servo,s142857/servo,dhananjay92/servo,wartman4404/servo,thiagopnts/servo,huonw/servo,chotchki/servo,peterjoel/servo,ruud-v-a/servo,deokjinkim/servo,nnethercote/servo,caldwell/servo,cbrewster/servo,nrc/servo,DominoTree/servo,dati91/servo,nerith/servo,jgraham/servo,larsbergstrom/servo,KiChjang/servo,nerith/servo,Adenilson/prototype-viewing-distance,KiChjang/servo,huonw/servo,pgonda/servo,jlegendary/servo,boghison/servo,canaltinova/servo,saratang/servo,dvberkel/servo,echochamber/servo,CJ8664/servo,nnethercote/servo,Adenilson/prototype-viewing-distance,tempbottle/servo,nerith/servo,evilpie/servo,rixrix/servo,pyfisch/servo,bjwbell/servo,rixrix/servo,codemac/servo,splav/servo,jgraham/servo,anthgur/servo,bjwbell/servo,eddyb/servo,ruud-v-a/servo,SimonSapin/servo,s142857/servo,nerith/servo,dsandeephegde/servo,zhangjunlei26/servo,anthgur/servo,jdramani/servo,bfrohs/servo,peterjoel/servo,WriterOfAlicrow/servo,runarberg/servo,tafia/servo,tempbottle/servo,youprofit/servo,tschneidereit/servo,boghison/servo,tschneidereit/servo,aweinstock314/servo,dmarcos/servo,dsandeephegde/servo,bjwbell/servo,j3parker/servo,dhananjay92/servo,shrenikgala/servo,mdibaiee/servo,juzer10/servo,dmarcos/servo,zentner-kyle/servo,huonw/servo,dvberkel/servo,mbrubeck/servo,boghison/servo,rentongzhang/servo,saratang/servo,ConnorGBrewster/servo,pgonda/servo,saratang/servo,froydnj/servo,pgonda/servo,jimberlage/servo,DominoTree/servo,splav/servo,mattnenterprise/servo,notriddle/servo,wartman4404/servo,bjwbell/servo,huonw/servo,eddyb/servo,notriddle/servo,saratang/servo,nick-thompson/servo,nnethercote/servo,Shraddha512/servo,s142857/servo,echochamber/servo,ConnorGBrewster/servo,tafia/servo,caldwell/servo,dagnir/servo,dvberkel/servo,avadacatavra/servo,paulrouget/servo,larsbergstrom/servo,codemac/servo,GreenRecycleBin/servo,tafia/servo,fiji-flo/servo,eddyb/servo