auto merge of #1401 : saneyuki/servo/unused, r=metajack
auto merge of #1401 : saneyuki/servo/unused, r=metajack

Fix this warning:
```
servo/src/components/gfx/platform/macos/font_list.rs:6:4: 6:42 warning: unused import, #[warn(unused_imports)] on by default
servo/src/components/gfx/platform/macos/font_list.rs:6 use font_context::FontContextHandleMethods;
```

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