Latest Headless Chrome 69 user agents:

User Agent Platform Device
Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) HeadlessChrome/69.0.3497.81 Safari/537.36 SQWatcher/201906 (sqcompliance.com/sqwatcher.html) GNU/Linux Unknown
Mozilla/5.0 (Windows NT 6.1; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) HeadlessChrome/69.0.3497.81 Safari/537.36 Windows 7 Unknown