Issue #3498750 by duaelfr: Remove deprecated code before 3.0.0 release

Closes #3498750

src/Plugin/ExtraFieldDisplayManagerInterface.php

@@ -10,21 +10,6 @@ use Drupal\Core\Entity\Display\EntityViewDisplayInterface;
  */
 interface ExtraFieldDisplayManagerInterface {
 
-  /**
-   * Exposes the ExtraFieldDisplay plugins to hook_entity_extra_field_info().
-   *
-   * @return array
-   *   The array structure is identical to that of the return value of
-   *   \Drupal\Core\Entity\EntityFieldManagerInterface::getExtraFields().
-   *
-   * @see hook_entity_extra_field_info()
-   *
-   * @deprecated in extra_field:8.x-2.0 and is removed from extra_field:3.0.0.
-   *   Use ExtraFieldManagerBaseInterface::fieldInfo instead.
-   * @see https://www.drupal.org/node/3071507
-   */
-  public function fieldInfo();
-
   /**
    * Clears locally cached data.
    */