Bug 1069915 - Privacy Panel

This is a new pull regrets for the Privacy Panel. I am very sorry to open another pull request instead of reopening the old one, but before I thought twice I have deleted my mold branch and had to reopen everything from the beginning. 
Based on my comment above, please pass the element as one of parameter inside this function. This is how we did in other menuItem : https://github.com/mozilla-b2g/gaia/blob/master/apps/settings/js/panels/root/battery_item.js#L19