Using past two years of chrome releases from wikipedia: https://en.wikipedia.org/wiki/Google_Chrome_version_history
Curve fit with almost perfect fit, take the simple y = mx + b and we can guess the latest version of chrome based on the current epoch.

javascript fiddle proof of concept: https://jsfiddle.net/artfulhacker/e6c1qmff/
var epoch = Date.now() / 1000;
var slope = 0.000000251;
var yintercept = -316;
alert(Math.floor(epoch * slope + yintercept));