Comment 2 for bug 1888380

Note: this message is only shown when Chromium is actually migrated, not when a user installs the `chromium-browser` package manually. Given that this was the way to install chromium in previous released, many users do this without reading the description of the package.

These users are also surprised that the snap is installed. It might be useful to show the message to everyone who installed chromium using the apt package.