Ux 2012 12 28 cherry picked

* [Bug 823675](https://bugzilla.mozilla.org/show_bug.cgi?id=823675) - Replaced clock app icon with dark version
* [Bug 818928](https://bugzilla.mozilla.org/show_bug.cgi?id=818928) - Video dialog tweak, added gray spec'd dialog, made some minor font tweaks, like removing references to bold
* Remove left border on passcode pad