Chrome Version (from the about:version page): 53.0.2785.89
Is this the most recent version: Yes
OS + version: Linux 4.7.2
CPU architecture (32-bit / 64-bit): 64-bit
Window manager: kwin_x11
URLs (if relevant): chrome://settings ?
Behavior in Linux Firefox: N/A
Behavior in Windows Chrome (if you have access to it): N/A

What steps will reproduce the problem?
(1) Enable Material Settings in chrome://flags
(2) Relaunch Browser
(3) Attempt to change Chrome theme to GTK theme

What is the expected result?
There should be an option for Chrome to use the GTK theme

What happens instead?
There is no option to use the GTK theme

Please provide any additional information below. Attach a screenshot
and backtrace if possible.