Issue #800968 by JacobSingh, ksenzee, Big Z: Tabledrag.js should not use...

Issue #800968 by JacobSingh, ksenzee, Big Z: Tabledrag.js should not use for...in to iterate over an array.

misc/tabledrag.js

@@ -1014,7 +1014,7 @@ Drupal.tableDrag.prototype.row.prototype.findSiblings = function(rowSettings) {
   var siblings = new Array();
   var directions = new Array('prev', 'next');
   var rowIndentation = this.indents;
-  for (var d in directions) {
+  for (var d = 0; d < directions.length; d++) {
     var checkRow = $(this.element)[directions[d]]();
     while (checkRow.length) {
       // Check that the sibling contains a similar target field.