[Bug 33820] Pressing power button displays dialog, it does not switch off computer

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Public bug reported:
https://launchpad.net/malone/bugs/33820

Affects: gnome-session (Ubuntu)
       Severity: Normal
       Priority: (none set)
         Status: Unconfirmed

Description:
In Dapper Flight 4 pressing the ACPI power button doesn't switch off the
computer as expected.

Instead it presents a modal dialog asking whether I wish to shut
down/reboot/logout/switch user.

This is contrary to Windows, every other Distribution I know and my long
established expectation. If I press the power button, ever, it is to
switch it off _now_. There is no ambiguity in my mind. It isn't easy to
depress the power button without intending to.

The last thing I want is a dialog asking 'Didn't you want to logout or
do something else, unrelated to pressing the power button?'. If I wanted
that, I'd go to Microsoft.