this is considered a large model. i think you might be surprised how many "small" models chrome has already pulled down on your disk.

but to answer your question: one of the services that uses a small model: PermissionsAIv4

""" Use the Permission Predictions Service and the AIv4 model to surface permission notification requests using a quieter UI when the likelihood of the user granting the permission is predicted to be low. Requires `Make Searches and Browsing Better` to be enabled. – Mac, Windows, Linux, ChromeOS, Android """