MAGETWO-52083: Use data interface resolver in ORM: Hydrator, operations, etc

- fixed incorrect reference

Author: Eugene Tulika

dev/tests/api-functional/_files/Magento/TestModuleDefaultHydrator/Model/ResourceModel/SaveHandler.php

@@ -7,7 +7,7 @@
 
 use Magento\Framework\EntityManager\Operation\ExtensionInterface;
 use Magento\TestModuleDefaultHydrator\Api\Data\ExtensionAttributeInterface;
-use Magento\Framework\EntityManager\MetadataPool;
+use Magento\Customer\Api\Data\CustomerInterface;
 use Magento\Framework\EntityManager\EntityManager;
 
 class SaveHandler implements ExtensionInterface