6 files declare their use of AccessResultInterface in Zircon Profile 8

AccessResultTest.php in core/tests/Drupal/Tests/Core/Access/AccessResultTest.php

Contains \Drupal\Tests\Core\Access\AccessResultTest.

Element.php in core/lib/Drupal/Core/Render/Element.php

Contains \Drupal\Core\Render\Element.

FormBuilder.php in core/lib/Drupal/Core/Form/FormBuilder.php

Contains \Drupal\Core\Form\FormBuilder.

MenuLinkTree.php in core/lib/Drupal/Core/Menu/MenuLinkTree.php

Contains \Drupal\Core\Menu\MenuLinkTree.

Renderer.php in core/lib/Drupal/Core/Render/Renderer.php

Contains \Drupal\Core\Render\Renderer.

RendererTest.php in core/tests/Drupal/Tests/Core/Render/RendererTest.php

Contains \Drupal\Tests\Core\Render\RendererTest.