New Security in Google Chrome 56
Starting in January 2017 (Chrome 56), Google Chrome will mark HTTP pages that collect passwords or credit cards as non-secure, as part of a long-term plan to mark all HTTP sites as non-secure.
You can read the info directly from Google itself.
Don't get caught out, as this will certainly lead visitors to abort your website the moment they see a "non-secure" notice.
Please contact James Shannon on 01254 277190 firstname.lastname@example.org who can help and advise you on all your security questions.