Firefox gives the same page and a link to Google Safe Browsing.
Perhaps the site was in the blacklist of Google.
Try to apply for an exception from the list here.
To check the current status of the site here.
At the moment reports
This website is unsafe.
The website healc.ru contains malicious content, including pages that:
Fraudulently entice users to provide personal information or download unwanted programs.
shanna.Wittin answered on April 3rd 20 at 17:20
Sign up to Google webmaster and there will be a submit button of the website to be re-evaluated
If scripts not, recheck quickly enough and the message will disappear
gerardo answered on April 3rd 20 at 17:22
If the browser complains, then there is a reason.
Apparently the site has no SSL certificate and that was the reason.