I am using the 58.0.3029.110 (64-bit) version of the browser (the last available here when creating this question), and when trying to execute the following code:
console.debug("Teste", 1);
The result is only:
undefined
And nothing is printed on the screen.
Chrome: 
Thesamecodeworksnormallyinotherbrowsers.
Firefox: 
IE: 
In the latest version of Chrome, some changes have been made to the console's filters.
Now it has a combo with the log level options, by default it comes as Info , which hides any log created by calls to console.debug() , to view these logs only need to change the level to Verbose .
Use console.log . console.debug is an alias of console.log .