Moves item to the given position in the menu.
If position is negative, or is larger than the number of items in the #WebKitContextMenu, the item is added on to the end of the menu. The first position is 0.
the #WebKitContextMenuItem to add
the new position to move the item
Moves item to the given position in the menu.
If position is negative, or is larger than the number of items in the #WebKitContextMenu, the item is added on to the end of the menu. The first position is 0.