style: Don't guard the context opacity keywords with the svg in opentype pref.
style: Don't guard the context opacity keywords with the svg in opentype pref.

This is effectively the stylo version of the second patch for bug 1365926, and
should fix bug 1442867.

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