At least selenium-chromium-driver is missing. Others may be missing too.
Comment From: philwebb
Closing in favor of PR #32861. Thanks @izeye
Comment From: wilkinsona
Turns out we're missing some dependencies in 2.6.x as well.
Comment From: wilkinsona
I've used this issue for 2.6.x. #32861 and its forward merge will take care of 2.7.x and main.