Issue #2969806 by mihai11, Jo Fitzgerald: Fix "CckFile is deprecated in Drupal...

Issue #2969806 by mihai11, Jo Fitzgerald: Fix "CckFile is deprecated in Drupal 8.3.x and will be be removed before Drupal 9.0.x. Use \Drupal\file\Plugin\migrate\process\d6\FieldFile instead." deprecation message

core/tests/Drupal/Tests/Listeners/DeprecationListenerTrait.php

@@ -132,7 +132,6 @@ public static function getSkippedDeprecations() {
       'Using UTF-8 route patterns without setting the "utf8" option is deprecated since Symfony 3.2 and will throw a LogicException in 4.0. Turn on the "utf8" route option for pattern "/place/meφω".',
       'Using UTF-8 route patterns without setting the "utf8" option is deprecated since Symfony 3.2 and will throw a LogicException in 4.0. Turn on the "utf8" route option for pattern "/PLACE/meφω".',
       'The Drupal\editor\Plugin\EditorBase::settingsFormValidate method is deprecated since version 8.3.x and will be removed in 9.0.0.',
-      'CckFile is deprecated in Drupal 8.3.x and will be be removed before Drupal 9.0.x. Use \Drupal\file\Plugin\migrate\process\d6\FieldFile instead.',
       'The Drupal\migrate\Plugin\migrate\process\Migration is deprecated in Drupal 8.4.0 and will be removed before Drupal 9.0.0. Instead, use Drupal\migrate\Plugin\migrate\process\MigrationLookup',
       'LinkField is deprecated in Drupal 8.3.x and will be be removed before Drupal 9.0.x. Use \Drupal\link\Plugin\migrate\field\d6\LinkField instead.',
       'CckFieldPluginBase is deprecated in Drupal 8.3.x and will be be removed before Drupal 9.0.x. Use \Drupal\migrate_drupal\Plugin\migrate\field\FieldPluginBase instead.',