chore(*): remove chromeos ebuilds and files

lots of stuff isn't needed from chromeos anymore, remove it.
fix(coreos-base/update_engine): use coreos-ca-certificates

missed fixing this up. Use the coreos-ca-certificates.
fix(coreos-base/crash-reporter): don't use chromeos*

fixup crash-reporter ebuild to not use chromeos* ebuilds.
Merge pull request #42 from philips/remove-chromeos

chore(*): remove chromeos ebuilds and files