I'm going to assume this is accidental, not intentional.
To me, this story (and the previous ones about all of the other Google apps breaking for new Edge, despite being Chromium, and not an issue for almost any other company on the web), is going to show Microsoft what happens when they get in bed with a scorpion.
Switching to Google technologies is almost always a mistake.
Given that Chrome is dominant, the answer is "a lot of effort". Anything less, and it looks like abuse of dominant position.
Edit: And the new Edge version likely identifies itself differently.