Remove default values from property, as they are injected via DI

Author: amenk

app/code/Magento/CatalogImportExport/Model/Import/Product/LinkProcessor.php

@@ -21,15 +21,10 @@
 class LinkProcessor
 {
     /**
-     * Links attribute name-to-link type ID.
-     * TODO: inject via DI
      * @var array
      */
-    protected $_linkNameToId = [
-        '_related_' => \Magento\Catalog\Model\Product\Link::LINK_TYPE_RELATED,
-        '_crosssell_' => \Magento\Catalog\Model\Product\Link::LINK_TYPE_CROSSSELL,
-        '_upsell_' => \Magento\Catalog\Model\Product\Link::LINK_TYPE_UPSELL,
-    ];
+    private $_linkNameToId;
+
     /**
      * @var array
      */