I've been trying to get this working all day, and I have a strong feeling that my issue is specific to Yosemite. I'm running OS X 10.10.3 on a retina Macbook Pro.
I took instructions from http://www.robpeck.com/2010/10/google-chrome-mac-os-x-and-self-signed-ssl-certificates/
But while that does indeed fix the errors thrown by Safari, it does not fix the issue in chrome. I can "proceed anyways" but the red crossed out lock is not going away. I want to implement a feature in a web app that requires SSL support in Chrome specifically, but I can't test it locally due to this issue.
Does anyone know why this is happening? Or if it's not even possible to do this?