Chrome Version: 71.0.3578.80 (Official Build) (64-bit)
OS: gLinux

This issue is similar to  https://crbug.com/883257 

What steps will reproduce the problem?
(1) Install Chuck Anderson theme "Offered by: extensions@chromium.org" (ttps://chrome.google.com/webstore/detail/chuck-anderson/gegkoiakifeoejnjkbnnojkkdoegeofp)
(2) Focus a different window while keeping the Chrome window visible.
(3) Notice the active tab text color going to white while the background color is also white.

What is the expected result?

Text color should remain dark or background color should become dark.

What happens instead?

Text color becomes white while the background color is (almost) white as well.