diff --git a/core/lib/Drupal/Core/Plugin/PluginBase.php b/core/lib/Drupal/Core/Plugin/PluginBase.php
index b957185..33c515a 100644
--- a/core/lib/Drupal/Core/Plugin/PluginBase.php
+++ b/core/lib/Drupal/Core/Plugin/PluginBase.php
@@ -35,7 +35,7 @@
    *
    * @return \Drupal\Core\Session\AccountInterface
    */
-  public function currentUser() {
+  protected function currentUser() {
     if (!$this->currentUser) {
       $this->currentUser = \Drupal::currentUser();
     }
@@ -43,20 +43,6 @@ public function currentUser() {
   }
 
   /**
-   * Sets the current active user.
-   *
-   * @param \Drupal\Core\Session\AccountInterface $user
-   *   The current user.
-   *
-   * @return self
-   *   The plugin object.
-   */
-  public function setCurrentUser(AccountInterface $user) {
-    $this->currentUser = $user;
-    return $this;
-  }
-
-  /**
    * Translates a string to the current language or to a given language.
    *
    * See the t() documentation for details.