you can inspect the chromium content interface. just look for the slot where chromium:icon-themes is plugged in, e.c. by:
$ snap connections chromium | grep chromium:icon-themes
if that snap doesn't provide you the user chosen icon theme it fallbacks to hicolor.
you can inspect the chromium content interface. just look for the slot where chromium: icon-themes is plugged in, e.c. by:
$ snap connections chromium | grep chromium: icon-themes
if that snap doesn't provide you the user chosen icon theme it fallbacks to hicolor.