Interesting. I had a look at the video https://www.youtube.com/watch?v=RAhYnK0v3rk, they talk about Chrome 41 that was released in March 2015.

It seems not simple to find a concise list of things changed since than.

From this page you can generate a change log between any different version, but I think is not what you mean when you said “concise”: https://omahaproxy.appspot.com/

Maybe install Chrome 41 somewhere and use it for testing