UserAgent: Mozilla/5.0 (Windows NT 10.0; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/52.0.2743.116 Safari/537.36

Steps to reproduce the problem:
1. Got to "Manage search engines..." in Settings. Note that the pre-installed default search engine has URL "{google:baseURL}search?q=%s&{google:RLZ}{google:originalQueryForSuggestion}{google:assistedQueryStats}{google:searchFieldtrialParameter}{google:iOSSearchLanguage}{google:searchClient}{google:sourceId}{google:instantExtendedEnabledParameter}{google:contextualSearchVersion}ie={inputEncoding}".
2. Create a new search engine. Give it any name and keyword you like. Give it the exact same pre-installed URL that I wrote above in step 1.
3. Make the newly created search engine the default one by clicking "Make default" next to it.
4. Open a new tab and write "dingo" in the address bar.

What is the expected behavior?
You should see multiple search suggestions (e.g. "dingo ate my baby") show up in a list beneath the address bar when you've written "dingo" there.

What went wrong?
You don't get any search suggestions. This happens even if the new default search engine has the exact same URL as the pre-installed default search engine.

The problem persists if you use a totally different URL as your default search engine too, for instance "https://www.google.com/ncr#q=%s" which I use because I want to avoid that Google stuffs me into a bubble depending on in what region I am.

In general the problem here is that the default search engine used to perform the final search and the search engine used to produce auto-complete suggestions (while you're typing your search query) aren't separated.

Did this work before? N/A 

Chrome version: 52.0.2743.116  Channel: stable
OS Version: 10.0
Flash Version: Shockwave Flash 22.0 r0