MAGETWO-66066: Remove usages of unserialize in module Magento/ImportExport

- Refactor

Author: Oleksandr Dubovyk

app/code/Magento/ImportExport/Model/Import/AbstractEntity.php

@@ -278,7 +278,7 @@ abstract class AbstractEntity
      *
      * @var Json
      */
-    private $serializer;
+    protected $serializer;
 
     /**
      * @param \Magento\Framework\Stdlib\StringUtils $string
@@ -288,7 +288,6 @@ abstract class AbstractEntity
      * @param \Magento\Framework\App\ResourceConnection $resource
      * @param ProcessingErrorAggregatorInterface $errorAggregator
      * @param array $data
-     * @param Json|null $json
      * @SuppressWarnings(PHPMD.NPathComplexity)
      */
     public function __construct(

app/code/Magento/ImportExport/Test/Unit/Model/Import/EntityAbstractTest.php

@@ -60,7 +60,6 @@ protected function _getModelDependencies()
         $importFactory = $this->getMock(\Magento\ImportExport\Model\ImportFactory::class, [], [], '', false);
         $resourceHelper = $this->getMock(\Magento\ImportExport\Model\ResourceModel\Helper::class, [], [], '', false);
         $resource = $this->getMock(\Magento\Framework\App\ResourceConnection::class, [], [], '', false);
-        $json = $this->getMock(\Magento\Framework\Serialize\Serializer\Json::class, [], [], '', false);
 
         $data = [
             'coreString' => $string,
@@ -77,8 +76,7 @@ protected function _getModelDependencies()
                 'max_data_size' => 1,
                 'bunch_size' => 1,
                 'collection_by_pages_iterator' => 'not_used',
-            ],
-            'json' => $json,
+            ]
         ];
 
         return $data;