Update amp-iframe container in build callback (#13242)
Update amp-iframe container in build callback (#13242)


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/amphtml,zhangsu/amphtml,engtat/amphtml,engtat/amphtml,powdercloud/amphtml,jpettitt/amphtml,yieldbot/amphtml,voyagegroup/amphtml,media-net/amphtml,sharethrough/amphtml,yandex-pcode/amphtml,engtat/amphtml,clawr/amphtml,voyagegroup/amphtml,mhc-gh/amphtml,sharethrough/amphtml,zhangsu/amphtml,luciancrasovan/amphtml,camelburrito/amphtml,jpettitt/amphtml,smartadserver/amphtml,koshka/amphtml,ampproject/amphtml,jpettitt/amphtml,pedjoni8/amphtml,mhc-gh/amphtml,voyagegroup/amphtml,camelburrito/amphtml,yandex-pcode/amphtml,taboola/amphtml,alanorozco/amphtml,src-code/amphtml,bpaduch/amphtml,smartadserver/amphtml,jridgewell/amphtml,aghassemi/amphtml,jridgewell/amphtml,BenDz/amphtml,rsimha-amp/amphtml,engtat/amphtml,kamtschatka/amphtml,erwinmombay/amphtml,widespace-os/amphtml,dotandads/amphtml,tlong2/amphtml,media-net/amphtml,voyagegroup/amphtml,src-code/amphtml,koshka/amphtml,cvializ/amphtml