Issue #3056409 by rkostov, larowlan, maximpodorov:...

Issue #3056409 by rkostov, larowlan, maximpodorov: BlockRepository::contextHandler is created dynamically

core/modules/block/src/BlockRepository.php

@@ -26,6 +26,13 @@ class BlockRepository implements BlockRepositoryInterface {
    */
   protected $themeManager;
 
+  /**
+   * The context handler.
+   *
+   * @var \Drupal\Core\Plugin\Context\ContextHandlerInterface
+   */
+  protected $contextHandler;
+
   /**
    * Constructs a new BlockRepository.
    *