Ux 2013 01 04 cherry picked

* [Bug 803449](https://bugzilla.mozilla.org/show_bug.cgi?id=803449) - Unidentifiable toggle in the notification bar
* [Bug 818216](https://bugzilla.mozilla.org/show_bug.cgi?id=818216) - [Sounds] Sounds Unlock
* [Bug 823515](https://bugzilla.mozilla.org/show_bug.cgi?id=823515) - Notification Time Stamp is too low
* [Bug 800016](https://bugzilla.mozilla.org/show_bug.cgi?id=800016) - Updated volume overlay icons to latest design.
* [Bug 806963](https://bugzilla.mozilla.org/show_bug.cgi?id=806963) - [Notifications] Different Icon Sizes used for 'System Update Available' and 'Downloading System Update' and the app is not to spec.