Fix warnings about two out of three missing natives for XMLList
Fix warnings about two out of three missing natives for XMLList

No idea yet what's up with XMLList#descendants.

tschneidereit/shumway,yurydelendik/shumway,mozilla/shumway,mbebenita/shumway,mbebenita/shumway,mbebenita/shumway,mozilla/shumway,mbebenita/shumway,yurydelendik/shumway,tschneidereit/shumway,yurydelendik/shumway,mozilla/shumway,mozilla/shumway,yurydelendik/shumway,tschneidereit/shumway,yurydelendik/shumway,mozilla/shumway,mbebenita/shumway,yurydelendik/shumway,tschneidereit/shumway,mozilla/shumway,tschneidereit/shumway,mbebenita/shumway,yurydelendik/shumway,yurydelendik/shumway,mbebenita/shumway,tschneidereit/shumway,mozilla/shumway,mozilla/shumway,mbebenita/shumway,tschneidereit/shumway,tschneidereit/shumway