Headless Chrome REPL not working

Use the binary /opt/google/chrome/chrome directly not google-chrome which points to bash script /usr/bin/google-chrome.

Taken from comments in

https://developers.google.com/web/updates/2017/04/headless-chrome#screenshots

type this

 alias chrome=/opt/google/chrome/chrome

then use chrome

 chrome --headless --disable-gpu --repl http://google.com