Chrome is trying really hard to prevent me from downloading the Mac App. Its saying 'Nautilus-1.2.0.dmg is not commonly downloaded and may be dangerous' and when I clicked to keep it another pop up came up with 'Even if you have downloaded files from this site before, the site may be temporarily unsafe (hacked). Try downloading this file later.'
I don't have any extra security (that I recall) set up on Chrome so I thought I would let you know.