When you're testing web functionality as of Chrome stable v68. a security measure was introduced within the browser to block non-secure content, sites using HTTP as well allowing on SHA1 certificates.
That could prevent you from executing automated tests compared to other browsers as Firefox & IE. That option can be disabled in Chromium as per the steps below in order to have a single execution flow for all browser platforms.
Add the steps involved:
You may want to check with the web app owner / security team about the certificate in any way as if you'll get that browser notification in production, users would experience the same behavior, so in production the proper certificate must be in place