restore polymer change

dashboard-ui/bower_components/polymer/polymer.html

@@ -651,7 +651,7 @@ prevent = dy > dx;
 prevent = dx > dy;
 }
 if (prevent) {
-ev.preventDefault();
+//ev.preventDefault();
 } else {
 Gestures.prevent('track');
 }

dashboard-ui/vulcanize-out.html

@@ -2765,7 +2765,7 @@ prevent = dy > dx;
 prevent = dx > dy;
 }
 if (prevent) {
-ev.preventDefault();
+//ev.preventDefault();
 } else {
 Gestures.prevent('track');
 }