It looks like upstream replaced them with noto-fonts: https://github.com/googlei18n/noto-fonts/blob/master/README.md Thanks
If I can offer 2 cents here, I think it'd be in everyone's best interest if the p.mask notices or whatever suggest media-fonts/roboto instead of Noto — there'll be mass revolt if you try telling people their upgrade path for a single TTF is nearly half a gigabyte in size.