Bug972573, The selection screen for adding a contact with multiple phone...

... numbers to a SMS message lacks a cancel, back, or 'x' button

Change from ValueSelector to ActionMenu

https://bugzilla.mozilla.org/show_bug.cgi?id=972573
Introducing additional `lenght` variable prevents us of checking length of the array in every iteration:
`for (var i = 0, l = data.list.length; i < l; i++)`. It's a little micro-optimization not really changing anything in this particular place, but it's part of our Code Guidelines.