Why not Opera? The new Opera is Chromium with what I think is a better design[1] that respects your OS[2]. You don't have to sign in to sync, but you can if you want. It's not open, but they're not an ad company. And finally, it's said to be faster than Chrome.

[1] I prefer Firefox so I use the FxOpera theme

[2] Well, it tries its best on Linux (unlike Chrome), but it's near perfect on Windows and Mac OS