www/chromium: update to 80.0.3987.163

[cem]

Summary

The Chrome stable channel has been updated to 80.0.3987.163[1], which is a
quick re-roll of the .162 release with a bad change reverted.

This includes 8 security fixes, including 3 Sev:High reported by external
researchers[2].

[1]: https://chromereleases.googleblog.com/2020/04/stable-channel-update-for-desktop.html
[2]: https://chromereleases.googleblog.com/2020/03/stable-channel-update-for-desktop_31.html

Test Plan

Built, youtube, various trivial browsing seems ok.

[jrm]

Looks good. A poudriere testport -j 11i386 www/chromium passed.

[rene]

Builds fine on 11.3-i386 too :)

[cem]

Thanks everyone for the quick testing and approval!