Remove unused mut in servo-util.
Remove unused mut in servo-util.

runarberg/servo,mdibaiee/servo,jimberlage/servo,froydnj/servo,KiChjang/servo,dagnir/servo,sadmansk/servo,tempbottle/servo,peterjoel/servo,caldwell/servo,dhananjay92/servo,paulrouget/servo,mt2d2/servo,juzer10/servo,vks/servo,evilpie/servo,michaelwu/servo,michaelwu/servo,saratang/servo,mattnenterprise/servo,seanmonstar/servo,KiChjang/servo,froydnj/servo,codemac/servo,avadacatavra/servo,nerith/servo,jdramani/servo,mt2d2/servo,steveklabnik/servo,pcwalton/servo,samfoo/servo,g-k/servo,dati91/servo,pgonda/servo,saneyuki/servo,KiChjang/servo,walac/servo,saneyuki/servo,jlegendary/servo,A-deLuna/servo,michaelwu/servo,hyowon/servo,ConnorGBrewster/servo,huonw/servo,brson/servo,eddyb/servo,nrc/servo,echochamber/servo,dagnir/servo,notriddle/servo,pyfisch/servo,vks/servo,metajack/servo,youprofit/servo,peterjoel/servo,KiChjang/servo,akosel/servo,cbrewster/servo,RenaudParis/servo,Shraddha512/servo,dhananjay92/servo,rixrix/servo,saratang/servo,zentner-kyle/servo,tschneidereit/servo,caldwell/servo,wpgallih/servo,mrobinson/servo,cbrewster/servo,tempbottle/servo,bjwbell/servo,mrobinson/servo,splav/servo,emilio/servo,zhangjunlei26/servo,jlegendary/servo,boghison/servo,canaltinova/servo,bfrohs/servo,nick-thompson/servo,vks/servo,larsbergstrom/servo,echochamber/servo,larsbergstrom/servo,GreenRecycleBin/servo,nerith/servo,evilpie/servo,thiagopnts/servo,WriterOfAlicrow/servo,caldwell/servo,nick-thompson/servo,avadacatavra/servo,mbrubeck/servo,nnethercote/servo,snf/servo,echochamber/servo,thiagopnts/servo,mattnenterprise/servo,splav/servo,aidanhs/servo,bhearsum-bors/servo,steveklabnik/servo,jimberlage/servo,nerith/servo,echochamber/servo,CJ8664/servo,jlegendary/servo,Adenilson/prototype-viewing-distance,SimonSapin/servo,Shraddha512/servo,peterjoel/servo,dsandeephegde/servo,emilio/servo,A-deLuna/servo,Adenilson/prototype-viewing-distance,jlegendary/servo,splav/servo,wartman4404/servo,jdramani/servo,juzer10/servo,rixrix/servo,jgraham/servo,sadmansk/servo,jlegendary/servo,nnethercote/servo,eddyb/servo,caldwell/servo,AnthonyBroadCrawford/servo,akosel/servo,echochamber/servo,shrenikgala/servo,froydnj/servo,zentner-kyle/servo,saneyuki/servo,seanmonstar/servo,notriddle/servo,dsandeephegde/servo,ConnorGBrewster/servo,SimonSapin/servo,walac/servo,j3parker/servo,brendandahl/servo,bfrohs/servo,GyrosOfWar/servo,CJ8664/servo,Aalhad/CanvasRenderingContext2DMozilla,mdibaiee/servo,codemac/servo,jlegendary/servo,ruud-v-a/servo,mrobinson/servo,RenaudParis/servo,mukilan/servo,DominoTree/servo,brson/servo,rixrix/servo,cbrewster/servo,owaspjocur/servo,snf/servo,nrc/servo,runarberg/servo,indykish/servo,paulrouget/servo,luniv/servo,SimonSapin/servo,paulrouget/servo,j3parker/servo,aweinstock314/servo,chotchki/servo,nick-thompson/servo,evilpie/servo,ryancanhelpyou/servo,paulrouget/servo,upsuper/servo,dhananjay92/servo,huonw/servo,splav/servo,DominoTree/servo,jgraham/servo,meh/servo,jimberlage/servo,jdramani/servo,pgonda/servo,jimberlage/servo,rnestler/servo,akosel/servo,eddyb/servo,pcwalton/servo,mbrubeck/servo,notriddle/servo,pgonda/servo,aidanhs/servo,youprofit/servo,upsuper/servo,evilpie/servo,A-deLuna/servo,szeged/servo,dati91/servo,huonw/servo,ConnorGBrewster/servo,mbrubeck/servo,jlegendary/servo,mbrubeck/servo,runarberg/servo,DominoTree/servo,juzer10/servo,zhangjunlei26/servo,CJ8664/servo,mdibaiee/servo,larsbergstrom/servo,dhananjay92/servo,brendandahl/servo,bjwbell/servo,indykish/servo,wpgallih/servo,DominoTree/servo,fiji-flo/servo,emilio/servo,codemac/servo,A-deLuna/servo,RenaudParis/servo,pyecs/servo,AnthonyBroadCrawford/servo,pyfisch/servo,walac/servo,rnestler/servo,sadmansk/servo,fiji-flo/servo,chotchki/servo,wpgallih/servo,GreenRecycleBin/servo,canaltinova/servo,metajack/servo,luniv/servo,jimberlage/servo,WriterOfAlicrow/servo,indykish/servo,aidanhs/servo,sadmansk/servo,j3parker/servo,nerith/servo,pyfisch/servo,anthgur/servo,s142857/servo,nrc/servo,tafia/servo,tschneidereit/servo,dmarcos/servo,GyrosOfWar/servo,RenaudParis/servo,evilpie/servo,dhananjay92/servo,anthgur/servo,codemac/servo,pyfisch/servo,dati91/servo,jgraham/servo,CJ8664/servo,caldwell/servo,youprofit/servo,eddyb/servo,karlito40/servo,ryancanhelpyou/servo,mbrubeck/servo,emilio/servo,mattnenterprise/servo,paulrouget/servo,hyowon/servo,michaelwu/servo,dsandeephegde/servo,GyrosOfWar/servo,tafia/servo,rentongzhang/servo,youprofit/servo,huonw/servo,nick-thompson/servo,dmarcos/servo,bjwbell/servo,DominoTree/servo,owaspjocur/servo,kindersung/servo,szeged/servo,bhearsum-bors/servo,pyfisch/servo,mt2d2/servo,upsuper/servo,rnestler/servo,s142857/servo,mdibaiee/servo,szeged/servo,dsandeephegde/servo,vks/servo,thiagopnts/servo,vks/servo,boghison/servo,seanmonstar/servo,luniv/servo,saratang/servo,srbhklkrn/SERVOENGINE,tschneidereit/servo,karlito40/servo,huonw/servo,Shraddha512/servo,dagnir/servo,saneyuki/servo,mt2d2/servo,s142857/servo,boghison/servo,dsandeephegde/servo,mdibaiee/servo,pyfisch/servo,splav/servo,bhearsum-bors/servo,DominoTree/servo,walac/servo,WriterOfAlicrow/servo,SimonSapin/servo,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/servo,juzer10/servo,splav/servo,chotchki/servo,peterjoel/servo,brendandahl/servo,brson/servo,A-deLuna/servo,upsuper/servo,runarberg/servo,AnthonyBroadCrawford/servo,brson/servo,GyrosOfWar/servo,Shraddha512/servo,bhearsum-bors/servo,rentongzhang/servo,dati91/servo,samfoo/servo,wpgallih/servo,zhangjunlei26/servo,aidanhs/servo,runarberg/servo,eddyb/servo,j3parker/servo,cbrewster/servo,runarberg/servo,GreenRecycleBin/servo,jgraham/servo,evilpie/servo,bhearsum-bors/servo,pyecs/servo,WriterOfAlicrow/servo,larsbergstrom/servo,deokjinkim/servo,karlito40/servo,GreenRecycleBin/servo,anthgur/servo,jgraham/servo,DominoTree/servo,splav/servo,nick-thompson/servo,karlito40/servo,fiji-flo/servo,Shraddha512/servo,mukilan/servo,pgonda/servo,fiji-flo/servo,indykish/servo,paulrouget/servo,rixrix/servo,jimberlage/servo,sadmansk/servo,steveklabnik/servo,sadmansk/servo,jimberlage/servo,pyecs/servo,dvberkel/servo,tafia/servo,mdibaiee/servo,wpgallih/servo,tempbottle/servo,peterjoel/servo,Aalhad/CanvasRenderingContext2DMozilla,upsuper/servo,tschneidereit/servo,tschneidereit/servo,s142857/servo,dvberkel/servo,SimonSapin/servo,CJ8664/servo,ryancanhelpyou/servo,canaltinova/servo,akosel/servo,canaltinova/servo,meh/servo,mattnenterprise/servo,aweinstock314/servo,GyrosOfWar/servo,pyecs/servo,ryancanhelpyou/servo,dati91/servo,anthgur/servo,wartman4404/servo,nnethercote/servo,rixrix/servo,youprofit/servo,s142857/servo,g-k/servo,dvberkel/servo,dagnir/servo,GreenRecycleBin/servo,runarberg/servo,dati91/servo,kindersung/servo,chotchki/servo,WriterOfAlicrow/servo,owaspjocur/servo,eddyb/servo,saneyuki/servo,shrenikgala/servo,bfrohs/servo,paulrouget/servo,nerith/servo,emilio/servo,indykish/servo,wartman4404/servo,bfrohs/servo,luniv/servo,avadacatavra/servo,dmarcos/servo,pyecs/servo,hyowon/servo,bjwbell/servo,indykish/servo,notriddle/servo,luniv/servo,srbhklkrn/SERVOENGINE,dmarcos/servo,srbhklkrn/SERVOENGINE,saneyuki/servo,aweinstock314/servo,meh/servo,karlito40/servo,walac/servo,tempbottle/servo,aweinstock314/servo,thiagopnts/servo,zhangjunlei26/servo,mrobinson/servo,shrenikgala/servo,notriddle/servo,g-k/servo,deokjinkim/servo,dvberkel/servo,pgonda/servo,meh/servo,pyfisch/servo,zhangjunlei26/servo,SimonSapin/servo,indykish/servo,rentongzhang/servo,snf/servo,ConnorGBrewster/servo,pcwalton/servo,GreenRecycleBin/servo,pcwalton/servo,emilio/servo,Aalhad/CanvasRenderingContext2DMozilla,szeged/servo,Aalhad/CanvasRenderingContext2DMozilla,metajack/servo,dvberkel/servo,nick-thompson/servo,rixrix/servo,GreenRecycleBin/servo,DominoTree/servo,codemac/servo,larsbergstrom/servo,zentner-kyle/servo,wartman4404/servo,peterjoel/servo,Adenilson/prototype-viewing-distance,emilio/servo,akosel/servo,jdramani/servo,mukilan/servo,Adenilson/prototype-viewing-distance,sadmansk/servo,jdramani/servo,saneyuki/servo,WriterOfAlicrow/servo,pyfisch/servo,canaltinova/servo,bfrohs/servo,luniv/servo,szeged/servo,notriddle/servo,ruud-v-a/servo,pgonda/servo,mbrubeck/servo,j3parker/servo,jgraham/servo,karlito40/servo,dsandeephegde/servo