Auto merge of #17503 - frewsxcv:frewsxcv-return-node-list-2, r=mbrubeck
Auto merge of #17503 - frewsxcv:frewsxcv-return-node-list-2, r=mbrubeck

Replace iterator struct with anonymous return iterator types.

Similar to https://github.com/servo/servo/pull/17488.

<!-- Reviewable:start -->
---
This change is [<img src="https://reviewable.io/review_button.svg" height="34" align="absmiddle" alt="Reviewable"/>](https://reviewable.io/reviews/servo/servo/17503)
<!-- Reviewable:end -->

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