The Google app uses Chrome Custom Tabs, which allows the calling application to filter the browser implementation by application ID. The documentation encourage

The Google app uses Chrome Custom Tabs, which allows the calling application to filter the browser implementation by application ID. The documentation encourages this by showing how to limit to the various Chrome app IDs (stable, beta, canary, and dev). Naturally, the user-respecting action is to try a CCT request with the default browser and fall back to known app IDs, but Google themselves don't do this and don't show how to do it in their documentation.