MAGETWO-38867: Create mixin for declarative widget description

Author: Ihor Melnychenko

lib/web/mage/apply/main.js

@@ -71,7 +71,6 @@ define([
                         element = itemContainer.el;
 
                     _.each(itemContainer.data, function (obj, key) {
-
                             if (obj.mixins) {
                                 require(obj.mixins, function () {
                                     for (var i = 0, len = arguments.length; i < len; i++) {