MAGETWO-19331: Impossible add to the shopping cart product with Custom option type="file"

changes from Ievgen Shakhsuvarov
static test fixes
(cherry picked from commit ec03baa)

app/code/Magento/Catalog/view/frontend/web/js/catalog-add-to-cart.js

@@ -38,6 +38,16 @@ define([
         },
 
         submitForm: function(form) {
+            var self = this;
+            if (form.has('input[type="file"]').length) {
+                self.element.off('submit');
+                form.submit();
+            } else {
+                self.ajaxSubmit(form);
+            }
+        },
+
+        ajaxSubmit: function(form) {
             var self = this;
             $.ajax({
                 url: form.attr('action'),

app/code/Magento/Sales/Controller/Download/DownloadCustomOption.php

@@ -7,9 +7,9 @@
 namespace Magento\Sales\Controller\Download;
 
 use Magento\Sales\Model\Download;
-use \Magento\Framework\App\Action\Context;
+use Magento\Framework\App\Action\Context;
 use Magento\Catalog\Model\Product\Type\AbstractType;
-use \Magento\Framework\Controller\Result\ForwardFactory;
+use Magento\Framework\Controller\Result\ForwardFactory;
 
 class DownloadCustomOption extends \Magento\Framework\App\Action\Action
 {

dev/tests/static/testsuite/Magento/Test/Legacy/_files/obsolete_classes.php

@@ -115,6 +115,7 @@ return [
     ['Magento\Sales\Block\Adminhtml\Order\Shipment\View', 'Magento\Shipping\Block\Adminhtml\View'],
     ['Magento\Sales\Block\Order\Shipment\Items', 'Magento\Shipping\Block\Items'],
     ['Magento\Sales\Controller\Adminhtml\Order\Shipment', 'Magento\Shipping\Controller\Adminhtml\Order\Shipment'],
+    ['Magento\Sales\Controller\Download'],
     ['Magento\Sales\Block\Order\Shipment', 'Magento\Shipping\Block\Order\Shipment'],
     ['Mage_Adminhtml_Block_Sales_Order_Create_Customer_Grid'],
     ['Mage_Adminhtml_Block_Sales_Order_Create_Search_Grid_Renderer_Giftmessage'],