Datepicker: Remove unused _getBorders() method.

Author: scottgonzalez

ui/jquery.ui.datepicker.js

@@ -823,18 +823,6 @@ $.extend(Datepicker.prototype, {
 		}
 	},
 
-	/* Retrieve the size of left and top borders for an element.
-	 * @param  elem  (jQuery object) the element of interest
-	 * @return  (number[2]) the left and top borders
-	 */
-	_getBorders: function(elem) {
-		var convert = function(value) {
-			return {thin: 1, medium: 2, thick: 3}[value] || value;
-		};
-		return [parseFloat(convert(elem.css("border-left-width"))),
-			parseFloat(convert(elem.css("border-top-width")))];
-	},
-
 	/* Check positioning to remain on screen. */
 	_checkOffset: function(inst, offset, isFixed) {
 		var dpWidth = inst.dpDiv.outerWidth(),