diff --git a/core/lib/Drupal/Core/Session/SessionManager.php b/core/lib/Drupal/Core/Session/SessionManager.php
index 82498050ad17a5dd0f4cfe2192d130a2809f9a28..f9496d394c280d4a282e31403985bdeec50ef1cd 100644
--- a/core/lib/Drupal/Core/Session/SessionManager.php
+++ b/core/lib/Drupal/Core/Session/SessionManager.php
@@ -263,29 +263,6 @@ public function delete($uid) {
       ->execute();
   }
 
-  /**
-   * {@inheritdoc}
-   */
-  public function isEnabled() {
-    return $this->writeSafeHandler->isSessionWritable();
-  }
-
-  /**
-   * {@inheritdoc}
-   */
-  public function disable() {
-    $this->writeSafeHandler->setSessionWritable(FALSE);
-    return $this;
-  }
-
-  /**
-   * {@inheritdoc}
-   */
-  public function enable() {
-    $this->writeSafeHandler->setSessionWritable(TRUE);
-    return $this;
-  }
-
   /**
    * {@inheritdoc}
    */
diff --git a/core/lib/Drupal/Core/Session/SessionManagerInterface.php b/core/lib/Drupal/Core/Session/SessionManagerInterface.php
index fad62b787d083c045632903c8d8b14670a5f0c22..d194002fa466e7d8d053b0312e851d21ea2cbb39 100644
--- a/core/lib/Drupal/Core/Session/SessionManagerInterface.php
+++ b/core/lib/Drupal/Core/Session/SessionManagerInterface.php
@@ -22,43 +22,6 @@ interface SessionManagerInterface extends SessionStorageInterface {
    */
   public function delete($uid);
 
-  /**
-   * Determines whether to save session data of the current request.
-   *
-   * @return bool
-   *   FALSE if writing session data has been disabled. TRUE otherwise.
-   *
-   * @deprecated in Drupal 8.0.x, will be removed before Drupal 8.0.0
-   *   Use \Drupal\Core\Session\WriteSafeSessionHandler::isSessionWritable()
-   */
-  public function isEnabled();
-
-  /**
-   * Temporarily disables saving of session data.
-   *
-   * This function allows the caller to temporarily disable writing of
-   * session data, should the request end while performing potentially
-   * dangerous operations, such as manipulating the global $user object.
-   *
-   * @see https://drupal.org/node/218104
-   *
-   * @return $this
-   *
-   * @deprecated in Drupal 8.0.x, will be removed before Drupal 8.0.0
-   *   Use \Drupal\Core\Session\WriteSafeSessionHandler::setSessionWritable(FALSE)
-   */
-  public function disable();
-
-  /**
-   * Re-enables saving of session data.
-   *
-   * @return $this
-   *
-   * @deprecated in Drupal 8.0.x, will be removed before Drupal 8.0.0
-   *   Use \Drupal\Core\Session\WriteSafeSessionHandler::setSessionWritable(True)
-   */
-  public function enable();
-
   /**
    * Sets the write safe session handler.
    *