Change Chrome Omnibox to use Google's NCR link
It's not working because you haven't edited [google:baseURL].
Use this string
https://www.google.com/search?q=%s
EDIT: See comments
Edit Sept 2015: This doesn't seem to work any more.
There's a better way. If you edit the search string in the Preferences, you won't get autofill results. If you do it this way, you will.
Change Chrome's Search Engine to Google.com: http://googlesystem.blogspot.ca/2013/07/change-chromes-search-engine-to.html
- Type google.com/ncr in the address bar and search for something
- Close Chrome
- Launch Chrome again, open a new tab and search for something using Chrome's omnibox.
- You should see an infobar that asks you: "would you like to search with google.com instead of [your local Google domain]?"