Oops. Thanks for the correction! Looks like Windows and Mac Chrome developers are out of luck now, unless they are brave enough to try a solution listed here:
https://stackoverflow.com/questions/23055651/disable-develop...
Chrome on Linux doesn't warn yet (I just tested it) and neither does Chromium.
The reason why? Malware was switching users to the dev channel to silence the warning. ¯\_(ツ)_/¯