How to kill chromium command line over ssh?

To exit Chromium gracefully use the following command:

pkill -o chromium

If you do not specify the "-o" ("--oldest") flag you might see the "Chromium didn't shut down correctly" pop-up next time you start Chromium. Because signal will be received by all chromium processes instead of just the main one.

Based on this answer.

pkill chromium

did the trick .