Changed protected to private modifier

Author: sedonik

app/code/Magento/AsynchronousOperations/Model/Operation.php

@@ -17,7 +17,7 @@ class Operation extends DataObject implements OperationInterface
     /**
      * @var OperationStatusValidator
      */
-    protected $operationStatusValidator;
+    private $operationStatusValidator;
 
     /**
      * Operation constructor.

app/code/Magento/AsynchronousOperations/Model/OperationStatusPool.php

@@ -15,7 +15,7 @@ class OperationStatusPool
     /**
      * @var array
      */
-    protected $statuses;
+    private $statuses;
 
     /**
      * @param array $statuses

app/code/Magento/AsynchronousOperations/Model/OperationStatusValidator.php

@@ -17,7 +17,7 @@ class OperationStatusValidator
     /**
      * @var OperationStatusPool
      */
-    protected $operationStatusPool;
+    private $operationStatusPool;
 
     /**
      * OperationStatusValidator constructor.