How to get rid of GNOME Shell Integration extension in Chromium on Debian?

sudo rm /etc/opt/chrome/policies/managed/chrome-gnome-shell.json
sudo rm /etc/chromium/policies/managed/chrome-gnome-shell.json

You may also need to delete the extension from the extensions folder in your profile path.

You can find this path @ chrome://version/ in the browser.

From: https://wiki.gnome.org/Projects/GnomeShellIbtegrationForChrome/Installation#Troubleshooting