Using DuckDuckGo in Chrome is like asking for privacy while walking around naked in Times Square. Chrome has 100% unrestricted access to anything your user can access on your PC, no matter what search engine you choose.
replies(2):
Do the autocomplete results still go to google? If so, then enabling DDG on chrome is indeed fruitless.
Unless you turn off some 10 or more options, it literally phones back your entire online activity, in or out of incognito mode, in or out of any google service.
"If a file isn’t from a known source, Chrome sends the URL and IP of the host and other meta data, such as the file’s hash and binary size, to Google."
[1] http://blog.chromium.org/2012/01/all-about-safe-browsing.htm...
[2] http://superuser.com/questions/387724/how-to-disable-downloa...