Regarding all the suggestions to change search engines:
Deleting the Google search entry is not an action that can easily be undone, and it will have drastic consequences, such as permanently disabling suggestions and instant for omnibox searches. Creating an alternate entry with the same URL does NOT suffice -- you can't manually enable any of this functionality on the alternate entry.
If you're having this bug, I suggest NOT doing this. Either sit tight until we fix, or if you do create a different entry, KEEP THE ORIGINAL so you can switch back once the fix is out.
--Peter Kasting, Chrome team member and owner of the Omnibox
Other engines can access this functionality just fine (and do, as other people have mentioned). We simply don't have UI for you to manually tweak the relevant settings. (There's a bug on adding such UI, but it's low-priority, so no one's gotten to it.)
Thanks for your openness. I must admit to being slightly amazed that Google would add an irreversible-delete-button to a consumer facing app, without appropriate warnings and whatnot. Is that just an oversight, or is it by design?
Create an alternate Google Search using something like https://encrypted.google.com/search?q=%s and leave the old one there. You can set the new one as default for the time being and revert to the original afterwards.