MAGETWO-47400: Fix L3

app/code/Magento/Downloadable/Test/Unit/Controller/Adminhtml/Product/Initialization/Helper/Plugin/DownloadableTest.php

@@ -5,6 +5,8 @@
  */
 namespace Magento\Downloadable\Test\Unit\Controller\Adminhtml\Product\Initialization\Helper\Plugin;
 
+use Magento\Catalog\Api\Data\ProductExtensionInterface;
+
 class DownloadableTest extends \PHPUnit_Framework_TestCase
 {
     /**
@@ -59,9 +61,7 @@ class DownloadableTest extends \PHPUnit_Framework_TestCase
             '',
             false
         );
-        $this->extensionAttributesMock = $this->getMockBuilder(
-                \Magento\Catalog\Api\Data\ProductExtensionInterface::class
-            )
+        $this->extensionAttributesMock = $this->getMockBuilder(ProductExtensionInterface::class)
             ->disableOriginalConstructor()
             ->setMethods(['setDownloadableProductSamples', 'setDownloadableProductLinks'])
             ->getMockForAbstractClass();