I just updated google-chrome-stable to version 32.0.1700.77 in my Ubuntu 13.04.
I tried to use this renamed feature, now called screen emulation, so I set the resolution to different values, but all I got was this message:
screen emulation is not available on this page
I can't confirm if is it working for other OS/Chrome versions setup, but I'm pretty sure that it may be a problem with Google Chrome for Linux. Also I can't find discussion, blog post or even Chrome changelog.
Is it a bug or is it something in Ubuntu?