UserAgent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/67.0.3396.79 Safari/537.36

Example URL:
basically any page that has a <video> tag in it. Sample: http://easyhtml5video.com/

Steps to reproduce the problem:
1. Go to http://easyhtml5video.com/ and play the video. You can only mute/unmute audio
2. Disable #enable-modern-media-controls in chrome://flags
3. Relaunch
4. Go back to http://easyhtml5video.com/ , rightclick on the video, press "show controls" and then you can see a volume control

What is the expected behavior?
Both versions of the media controls should allow increasing/decreasing the volume of a video

What went wrong?
Seems like chromium devs don't have time to watch videos, or always watch on full volume ;-)

Did this work before? N/A 

Is it a problem with Flash or HTML5? HTML5

Does this work in other browsers? Yes

Chrome version: 67.0.3396.79  Channel: n/a
OS Version: 10.0
Flash Version: 

Contents of chrome://gpu: