That's pretty funny. Go ahead and run Chrome, then pick preferences. Scroll down to the bottom and take a look at default browser. Does it say "Chrome is already your default browser?" If so, I'm sure you can go in Safari preferences and switch it back. Though I have no idea why anyone on a Mac would make Safari their default browser. It's almost as bad as making IE your default browser on that other OS.

But if that what you want to do, as long as you have your OS and Safari updated then go for it.