style: Unify MediaList and ServoMediaList.
style: Unify MediaList and ServoMediaList.

Bug: 1456471
Reviewed-by: xidorn
MozReview-Commit-ID: KFWxoohpGlb

szeged/servo,cbrewster/servo,ConnorGBrewster/servo,notriddle/servo,peterjoel/servo,emilio/servo,mbrubeck/servo,ConnorGBrewster/servo,notriddle/servo,KiChjang/servo,dati91/servo,nnethercote/servo,avadacatavra/servo,paulrouget/servo,nnethercote/servo,jimberlage/servo,emilio/servo,cbrewster/servo,pyfisch/servo,nnethercote/servo,saneyuki/servo,pyfisch/servo,sadmansk/servo,splav/servo,peterjoel/servo,notriddle/servo,sadmansk/servo,splav/servo,saneyuki/servo,larsbergstrom/servo,sadmansk/servo,larsbergstrom/servo,SimonSapin/servo,saneyuki/servo,larsbergstrom/servo,SimonSapin/servo,notriddle/servo,notriddle/servo,nnethercote/servo,pyfisch/servo,dati91/servo,nnethercote/servo,SimonSapin/servo,cbrewster/servo,mbrubeck/servo,avadacatavra/servo,emilio/servo,szeged/servo,notriddle/servo,notriddle/servo,ConnorGBrewster/servo,SimonSapin/servo,cbrewster/servo,KiChjang/servo,avadacatavra/servo,peterjoel/servo,notriddle/servo,mbrubeck/servo,larsbergstrom/servo,jimberlage/servo,szeged/servo,szeged/servo,pyfisch/servo,mbrubeck/servo,paulrouget/servo,KiChjang/servo,paulrouget/servo,paulrouget/servo,nnethercote/servo,mbrubeck/servo,emilio/servo,avadacatavra/servo,DominoTree/servo,paulrouget/servo,KiChjang/servo,dati91/servo,KiChjang/servo,canaltinova/servo,splav/servo,saneyuki/servo,pyfisch/servo,paulrouget/servo,splav/servo,pyfisch/servo,SimonSapin/servo,peterjoel/servo,canaltinova/servo,canaltinova/servo,szeged/servo,notriddle/servo,emilio/servo,emilio/servo,peterjoel/servo,pyfisch/servo,paulrouget/servo,pyfisch/servo,avadacatavra/servo,sadmansk/servo,canaltinova/servo,sadmansk/servo,pyfisch/servo,sadmansk/servo,dati91/servo,jimberlage/servo,saneyuki/servo,emilio/servo,cbrewster/servo,ConnorGBrewster/servo,emilio/servo,DominoTree/servo,avadacatavra/servo,jimberlage/servo,nnethercote/servo,KiChjang/servo,canaltinova/servo,DominoTree/servo,KiChjang/servo,DominoTree/servo,nnethercote/servo,cbrewster/servo,ConnorGBrewster/servo,saneyuki/servo,dati91/servo,DominoTree/servo,SimonSapin/servo,larsbergstrom/servo,ConnorGBrewster/servo,splav/servo,szeged/servo,avadacatavra/servo,DominoTree/servo,peterjoel/servo,splav/servo,dati91/servo,cbrewster/servo,larsbergstrom/servo,mbrubeck/servo,saneyuki/servo,peterjoel/servo,peterjoel/servo,splav/servo,larsbergstrom/servo,szeged/servo,szeged/servo,KiChjang/servo,KiChjang/servo,paulrouget/servo,paulrouget/servo,emilio/servo,larsbergstrom/servo,jimberlage/servo,cbrewster/servo,KiChjang/servo,nnethercote/servo,notriddle/servo,szeged/servo,emilio/servo,avadacatavra/servo,canaltinova/servo,saneyuki/servo,peterjoel/servo,dati91/servo,mbrubeck/servo,saneyuki/servo,mbrubeck/servo,jimberlage/servo,DominoTree/servo,larsbergstrom/servo,jimberlage/servo,splav/servo,sadmansk/servo,ConnorGBrewster/servo,canaltinova/servo,splav/servo,sadmansk/servo,DominoTree/servo,DominoTree/servo,canaltinova/servo,larsbergstrom/servo,saneyuki/servo,peterjoel/servo,DominoTree/servo,splav/servo,ConnorGBrewster/servo,dati91/servo,SimonSapin/servo,szeged/servo,jimberlage/servo,pyfisch/servo,nnethercote/servo,SimonSapin/servo,jimberlage/servo,paulrouget/servo