Autocomplete combobox demo: Define this.wrapper for use inside destroy().

(cherry picked from commit c974d0fc69)

demos/autocomplete/combobox.html

@@ -40,7 +40,7 @@
 					select = this.element.hide(),
 					selected = select.children( ":selected" ),
 					value = selected.val() ? selected.text() : "",
-					wrapper = $( "<span>" )
+					wrapper = this.wrapper = $( "<span>" )
 						.addClass( "ui-combobox" )
 						.insertAfter( select );