It appears this is no longer included in the data.tar archive; instead, the
postinst script creates it when installed using dpkg.
https://bugs.gentoo.org/588318
Package-Manager: portage-2.3.0_p11
insinto /
doins -r opt usr
+ dosym "/${CHROME_HOME}/${PN}" "/usr/bin/${PN}"
find "${ED}" -type d -empty -delete || die
chmod 755 "${ED}${CHROME_HOME}"/{chrome,${PN},nacl_helper{,_bootstrap},xdg-{mime,settings}} || die