[jimmybot]

One thing that Chrome doesn't do is even when there are zero windows open, you still have to hold down Command-Q to quit. If no windows are open, there doesn't appear to be any danger in quitting right away--after all, the major mis-press is when you try to hit Command-W to close a window and instead hit Command-Q, but if there are no windows open, there's no reason to be hitting Command-W.