Most important argument: the chrome user-agent contains the word 'mozilla'. Obviously (we argue) google isn't intending these to be accurate and instead are some kind of compatibility mark.

Are you committing trademark violation? Given the nature of trademarks, it's not clear that you are.

Are you misrepresenting yourself to the site in a way that violates the CFAA? This is probably your biggest area of risk. But you can argue the site is giving away information to google, a company whose slogan until recently was 'free the world's information'. Therefore they weren't taking plausible steps to secure the information you've scraped.