It caused rendering issues just like a reftest in this commit. We don't know
the reason but fixing it will be some amount of work which couldn't be uplifted
to 68. So we just revert the change here now. Probably we should revisit the
problem once we got a bug report that the lack of the `transform-style: inherit`
causes rendering issues.
Differential Revision: https://phabricator.services.mozilla.com/D35946
--HG--
extra : moz-landing-system : lando
Hiroyuki Ikezoe