Apple has a feature that I heard about, someone wanted to connect to the WiFi but didn't have the password, his friend was on her Mac on that WiFi network and g

Apple has a feature that I heard about, someone wanted to connect to the WiFi but didn't have the password, his friend was on her Mac on that WiFi network and got a prompt if she wanted to share the WiFi password to him (my guess is because they have each other on their phone books). So if you're working from home on the same WiFi, or if your phone with the Google account has been connected to the work WiFi, Google could be thinking "Ah, they're trying to login, let's offer them their account as auto-complete!". It's at least one speculation, who knows if they've bothered with such a thing. An idea would be to totally remove Chrome from the work laptop, reinstall it, open Developer Tools, and monitor what data comes as you're trying to login.