It wasn't history for me, there are issues in the older version of chromium/cef - ie, branch 2526 is 1.5 years old and still requires chrome_sandbox.
The problem is that chromium stopped supporting 32 bit; so you can't just use the latest version.
However, I'm using 64bit (linux) and I DID get the latest version (branch 3029) and everything works smoothly now.
My final work/result can be found here: https://github.com/AlericInglewood/3p-llceflib
Only works for linux64, because I can't and haven't tested MacOS / Windows (both of which need to be 64bit then anyway).