Google has no decision to make here. They have a policy and system that aligns geographical names based on country records. The rest of the world will continue to see Gulf of Mexico and Lake Ontario. Those are not the only two conflicted names across the world, there are far more.

That is how it has always worked. Most of the rest of the world sees Gulf of Mexico and will see Lake Ontario.

There are a lot more disputed and conflicting geographical names than these two. Google has a system in place that aligns naming by country.