Installing Burp's CA Certificate in Chrome
Note: The Chrome browser picks up the certificate trust store from your host computer. By installing Burp's CA certificate in your computer’s built-in browser (e.g. Internet Explorer on Windows, or Safari on OS X), Chrome will automatically make use of the certificate.
You can access your systems certificate trust store at Chrome settings > HTTPS/SSL.
Or you can follow the relevant instructions for your built-in browser:
When the Burp CA certificate has been installed for your built-in browser, restart Chrome and you should be able to visit any HTTPS URL via Burp without any security warnings.