auto merge of #4097 : orteipid/servo/fix_deprecation, r=SimonSapin
auto merge of #4097 : orteipid/servo/fix_deprecation, r=SimonSapin

    selector_matching.rs:1263:44: 1263:63 warning: use of deprecated item: Renamed to `get`, #[warn(deprecated)] on by default
    selector_matching.rs:1263         assert_eq!(1, selector_map.id_hash.find(&atom!("top")).unwrap()[0].declarations.source_order);
                                                                         ^~~~~~~~~~~~~~~~~~~
    selector_matching.rs:1265:47: 1265:79 warning: use of deprecated item: Renamed to `get`, #[warn(deprecated)] on by default
    selector_matching.rs:1265         assert_eq!(0, selector_map.class_hash.find(&Atom::from_slice("intro")).unwrap()[0].declarations.source_order);
                                                                            ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    selector_matching.rs:1266:41: 1266:71 warning: use of deprecated item: Renamed to `get`, #[warn(deprecated)] on by default
    selector_matching.rs:1266         assert!(selector_map.class_hash.find(&Atom::from_slice("foo")).is_none());
                                                                      ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

The 'find' function was changed to 'get'. Updated to remove this warning given when running the tests.

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