MAGETWO-62134: Create data converter that can process nested serialized data

Resolving code review feedback

app/code/Magento/Bundle/Model/Sales/Order/Pdf/Items/AbstractItems.php

@@ -6,6 +6,7 @@
 namespace Magento\Bundle\Model\Sales\Order\Pdf\Items;
 
 use Magento\Catalog\Model\Product\Type\AbstractType;
+use Magento\Framework\App\ObjectManager;
 use Magento\Framework\Serialize\Serializer\Json;
 
 /**
@@ -46,7 +47,7 @@ abstract class AbstractItems extends \Magento\Sales\Model\Order\Pdf\Items\Abstra
         array $data = [],
         Json $serializer = null
     ) {
-        $this->serializer = $serializer ?: \Magento\Framework\App\ObjectManager::getInstance()->get(Json::class);
+        $this->serializer = $serializer ?: ObjectManager::getInstance()->get(Json::class);
         parent::__construct(
             $context,
             $registry,