If you navigate to a URL that does not exist, Google Chrome may send the URL to Google so we can help you find the URL you were looking for. You can disable this feature as explained here.
Well... if you are that paranoid, then you're not using services like OpenDNS as well I guess since it also has this feature (actually it is 2 times dangerous on your POV since OpenDNS response page uses Google search I believe). Perhaps we need to edit all sites by hand in the hosts file instead of dns servers or just pull the plug :p
And I wonder; are you using google.com at all? since it has all these features in it