Bug 1331213: Implement Device::media_type, without supporting overrides for now. r=heycam
Bug 1331213: Implement Device::media_type, without supporting overrides for now. r=heycam

MozReview-Commit-ID: 9AeHViwoX1t
Signed-off-by: Emilio Cobos Álvarez <86fa523305b8ad6a8a853c04cfef24a0445908d3@crisal.io>

eddyb/servo,fiji-flo/servo,eddyb/servo,cbrewster/servo,canaltinova/servo,DominoTree/servo,larsbergstrom/servo,peterjoel/servo,dsandeephegde/servo,rnestler/servo,SimonSapin/servo,rnestler/servo,cbrewster/servo,splav/servo,thiagopnts/servo,pyfisch/servo,nnethercote/servo,rnestler/servo,CJ8664/servo,mattnenterprise/servo,rnestler/servo,notriddle/servo,eddyb/servo,emilio/servo,szeged/servo,emilio/servo,upsuper/servo,thiagopnts/servo,SimonSapin/servo,rnestler/servo,CJ8664/servo,mbrubeck/servo,sadmansk/servo,rnestler/servo,CJ8664/servo,SimonSapin/servo,emilio/servo,ConnorGBrewster/servo,fiji-flo/servo,mbrubeck/servo,ConnorGBrewster/servo,pyfisch/servo,SimonSapin/servo,KiChjang/servo,avadacatavra/servo,splav/servo,jimberlage/servo,sadmansk/servo,peterjoel/servo,paulrouget/servo,saneyuki/servo,nnethercote/servo,dati91/servo,DominoTree/servo,anthgur/servo,canaltinova/servo,dati91/servo,cbrewster/servo,szeged/servo,mattnenterprise/servo,dsandeephegde/servo,pyfisch/servo,cbrewster/servo,paulrouget/servo,jimberlage/servo,KiChjang/servo,larsbergstrom/servo,notriddle/servo,dati91/servo,thiagopnts/servo,sadmansk/servo,paulrouget/servo,saneyuki/servo,nnethercote/servo,saneyuki/servo,CJ8664/servo,larsbergstrom/servo,fiji-flo/servo,dsandeephegde/servo,DominoTree/servo,paulrouget/servo,mattnenterprise/servo,larsbergstrom/servo,CJ8664/servo,avadacatavra/servo,dsandeephegde/servo,paulrouget/servo,DominoTree/servo,eddyb/servo,rnestler/servo,notriddle/servo,notriddle/servo,nnethercote/servo,anthgur/servo,szeged/servo,KiChjang/servo,peterjoel/servo,eddyb/servo,larsbergstrom/servo,jimberlage/servo,canaltinova/servo,upsuper/servo,sadmansk/servo,emilio/servo,pyfisch/servo,avadacatavra/servo,KiChjang/servo,CJ8664/servo,szeged/servo,splav/servo,peterjoel/servo,canaltinova/servo,emilio/servo,mbrubeck/servo,splav/servo,canaltinova/servo,larsbergstrom/servo,KiChjang/servo,anthgur/servo,anthgur/servo,anthgur/servo,DominoTree/servo,DominoTree/servo,peterjoel/servo,saneyuki/servo,notriddle/servo,peterjoel/servo,dati91/servo,peterjoel/servo,jimberlage/servo,SimonSapin/servo,fiji-flo/servo,dati91/servo,ConnorGBrewster/servo,notriddle/servo,notriddle/servo,dsandeephegde/servo,pyfisch/servo,paulrouget/servo,emilio/servo,anthgur/servo,ConnorGBrewster/servo,eddyb/servo,jimberlage/servo,thiagopnts/servo,sadmansk/servo,dsandeephegde/servo,mattnenterprise/servo,thiagopnts/servo,emilio/servo,emilio/servo,pyfisch/servo,avadacatavra/servo,mbrubeck/servo,jimberlage/servo,SimonSapin/servo,notriddle/servo,sadmansk/servo,KiChjang/servo,larsbergstrom/servo,upsuper/servo,dati91/servo,canaltinova/servo,KiChjang/servo,peterjoel/servo,KiChjang/servo,avadacatavra/servo,sadmansk/servo,DominoTree/servo,saneyuki/servo,dati91/servo,mbrubeck/servo,szeged/servo,saneyuki/servo,ConnorGBrewster/servo,avadacatavra/servo,DominoTree/servo,mattnenterprise/servo,DominoTree/servo,pyfisch/servo,jimberlage/servo,splav/servo,eddyb/servo,saneyuki/servo,mattnenterprise/servo,larsbergstrom/servo,peterjoel/servo,pyfisch/servo,paulrouget/servo,splav/servo,upsuper/servo,pyfisch/servo,jimberlage/servo,notriddle/servo,nnethercote/servo,nnethercote/servo,larsbergstrom/servo,KiChjang/servo,upsuper/servo,cbrewster/servo,fiji-flo/servo,ConnorGBrewster/servo,KiChjang/servo,cbrewster/servo,dsandeephegde/servo,peterjoel/servo,mbrubeck/servo,saneyuki/servo,dati91/servo,emilio/servo,mattnenterprise/servo,saneyuki/servo,splav/servo,nnethercote/servo,szeged/servo,avadacatavra/servo,szeged/servo,canaltinova/servo,thiagopnts/servo,szeged/servo,fiji-flo/servo,upsuper/servo,nnethercote/servo,fiji-flo/servo,upsuper/servo,mbrubeck/servo,dsandeephegde/servo,splav/servo,notriddle/servo,ConnorGBrewster/servo,splav/servo,pyfisch/servo,nnethercote/servo,eddyb/servo,SimonSapin/servo,avadacatavra/servo,CJ8664/servo,mattnenterprise/servo,szeged/servo,rnestler/servo,anthgur/servo,SimonSapin/servo,anthgur/servo,CJ8664/servo,thiagopnts/servo,paulrouget/servo,thiagopnts/servo,nnethercote/servo,emilio/servo,saneyuki/servo,paulrouget/servo,upsuper/servo,larsbergstrom/servo,DominoTree/servo,szeged/servo,cbrewster/servo,mbrubeck/servo,canaltinova/servo,paulrouget/servo,sadmansk/servo,cbrewster/servo,ConnorGBrewster/servo,fiji-flo/servo,splav/servo,jimberlage/servo