Followup 5592ea26: bind native focus/blur events instead of jQuery events

In jQuery 1.8, if you focus something using jQuery, the jQuery focus
event fires before the jQuery blur event, which is wrong. If you focus
something natively, the events do fire in the correct order.
See http://jsfiddle.net/WGy9h/4/ .

Fortunately, the native events always fire in the correct order, so
listen to those instead. Normally, we're not concerned with the order,
but in ce.Surface we bind the same focus/blur handlers to a pair of two
nodes, and then if the focus moves from one to the other, we'll get
confused by the events being emitted in the wrong order.

Change-Id: Ia585b42b6deb74ba55a2d55ce1922b1e04d85e81