Didn't work for me on my retina MBP either.

Wouldn't be surprised if our Mac notebooks, being SSD based, didn't have the SMS

Edit: Apple says all Intel Mac notebooks have the SMS, but then goes on to say that SSD notebooks don't use them http://support.apple.com/en-us/HT1935

Hm. http://caniuse.com/deviceorientation links to https://www.chromestatus.com/features/5874690627207168 , which claims it's been on by default since Chrome 7. The model list in http://crbug.com/44654 lists only MacBook Pros, though -- I have a mid-2012 MBP that originally shipped with a spinning disk. (It's possible that the Airs, which only ship with SSDs, don't have an accelerometer?)

I had this work on my late 2008 macbook pro a long while ago.