Packages:

• www-client/google-chrome
• www-client/google-chrome-beta
• www-client/google-chrome-unstable

are missing SELinux policy although:
1) it's defined for www-client/chromium: https://code.funtoo.org/bitbucket/projects/AUTO/repos/net-kit/browse/www-client/chromium/chromium-72.0.3626.28.ebuild#86
2) Google Chrome is supported: https://github.com/SELinuxProject/refpolicy/blob/master/policy/modules/apps/chromium.fc#L1-L20

this is a replication of https://bugs.gentoo.org/697564
PR to gentoo repo: https://github.com/gentoo/gentoo/pull/13264