style: Add a no-op constructor of StyleSheetEntry, in preparation for more changes.
style: Add a no-op constructor of StyleSheetEntry, in preparation for more changes.

MozReview-Commit-ID: 6Kz0S7YYmFC
Signed-off-by: Emilio Cobos Álvarez <86fa523305b8ad6a8a853c04cfef24a0445908d3@crisal.io>

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