MAGETWO-64477: [Indexer optimizations] Indexation process in non-locking way for product indexer

- build stabilization

Author: irenelagno

app/code/Magento/Catalog/Model/ResourceModel/Product/Collection.php

@@ -18,7 +18,6 @@
 use Magento\Framework\DB\Select;
 use Magento\Framework\EntityManager\MetadataPool;
 use Magento\Store\Model\Store;
-use Magento\Catalog\Model\Product\Gallery\ReadHandler as GalleryReadHandler;
 use Magento\Catalog\Model\ResourceModel\Product\Indexer\Category\Product\FrontendResource as CategoryProductFrontend;
 
 /**