Create chevron using pseudo elements

IE8+ supports the pseudo element. The world will not explode if
IE6 and 7 do not have the chevron.

This simplifies code by dropping the use of the pokey element

Note: I know we can drop using the image too but I decided not to do
that in this patch.

Change-Id: Ia9ac434461e63bc2cf8554060126995ac65a3531