Indeed they did, but Apple didn't pull it off nearly as well. Google got it right with normal sized tabs. Having the tabs span across the entire title bar in Safari 4 is just pointless and difficult. Just means you need to move your mouse more when switching between tabs.
I'm still sticking to Google Chrome as my default. Maybe they'll fix up the UI in later builds. I am impressed that Apple actually managed to develop a program for Windows that doesn't use OSX visual styling though.