As of Mountain Lion, Google Chrome has asked for permission to view my contacts. Does this mean that it has likely had unrestricted access before? I'm not sure why Chrome wants this access, but since prior to Mountain Lion there wasn't a prompt for this, it makes me think that it must have been looking at them this whole time. Right?
To turn this off and eliminate the error messages, you can do the following:


Click the Chrome menu  on the browser toolbar. Select Settings.
Click Show advanced settings and find the "Passwords and forms" section.
Click "Manage Autofill Settings" 
Deselect the "Include addresses from my Address Book card" checkbox.