diff --git a/core/modules/ban/lib/Drupal/ban/Form/BanAdmin.php b/core/modules/ban/lib/Drupal/ban/Form/BanAdmin.php
index 9e31af2..c47bdcc 100644
--- a/core/modules/ban/lib/Drupal/ban/Form/BanAdmin.php
+++ b/core/modules/ban/lib/Drupal/ban/Form/BanAdmin.php
@@ -7,16 +7,14 @@
 
 namespace Drupal\ban\Form;
 
-use Drupal\Core\Controller\ControllerInterface;
-use Drupal\Core\Form\FormInterface;
+use Drupal\Core\Form\FormBase;
 use Drupal\ban\BanIpManager;
-use Symfony\Component\HttpFoundation\Request;
 use Symfony\Component\DependencyInjection\ContainerInterface;
 
 /**
  * Displays banned IP addresses.
  */
-class BanAdmin implements FormInterface, ControllerInterface {
+class BanAdmin extends FormBase {
 
   /**
    * @var \Drupal\ban\BanIpManager
@@ -24,13 +22,6 @@ class BanAdmin implements FormInterface, ControllerInterface {
   protected $ipManager;
 
   /**
-   * The request object.
-   *
-   * @var \Symfony\Component\HttpFoundation\Request
-   */
-  protected $request;
-
-  /**
    * Constructs a new BanAdmin object.
    *
    * @param \Drupal\ban\BanIpManager $ip_manager
@@ -62,17 +53,16 @@ public function getFormID() {
    *   (optional) IP address to be passed on to drupal_get_form() for use as the
    *   default value of the IP address form field.
    */
-  public function buildForm(array $form, array &$form_state, Request $request = NULL, $default_ip = '') {
-    $this->request = $request;
+  public function buildForm(array $form, array &$form_state, $default_ip = '') {
     $rows = array();
-    $header = array(t('banned IP addresses'), t('Operations'));
+    $header = array($this->t('banned IP addresses'), $this->t('Operations'));
     $result = $this->ipManager->findAll();
     foreach ($result as $ip) {
       $row = array();
       $row[] = $ip->ip;
       $links = array();
       $links['delete'] = array(
-        'title' => t('delete'),
+        'title' => $this->t('delete'),
         'href' => "admin/config/people/ban/delete/$ip->iid",
       );
       $row[] = array(
@@ -85,24 +75,24 @@ public function buildForm(array $form, array &$form_state, Request $request = NU
     }
 
     $form['ip'] = array(
-      '#title' => t('IP address'),
+      '#title' => $this->t('IP address'),
       '#type' => 'textfield',
       '#size' => 48,
       '#maxlength' => 40,
       '#default_value' => $default_ip,
-      '#description' => t('Enter a valid IP address.'),
+      '#description' => $this->t('Enter a valid IP address.'),
     );
     $form['actions'] = array('#type' => 'actions');
     $form['actions']['submit'] = array(
       '#type' => 'submit',
-      '#value' => t('Add'),
+      '#value' => $this->t('Add'),
     );
 
     $form['ban_ip_banning_table'] = array(
       '#theme' => 'table',
       '#header' => $header,
       '#rows' => $rows,
-      '#empty' => t('No blocked IP addresses available.'),
+      '#empty' => $this->t('No blocked IP addresses available.'),
       '#weight' => 120,
     );
     return $form;
@@ -114,13 +104,13 @@ public function buildForm(array $form, array &$form_state, Request $request = NU
   public function validateForm(array &$form, array &$form_state) {
     $ip = trim($form_state['values']['ip']);
     if ($this->ipManager->isBanned($ip)) {
-      form_set_error('ip', t('This IP address is already banned.'));
+      form_set_error('ip', $this->t('This IP address is already banned.'));
     }
-    elseif ($ip == $this->request->getClientIP()) {
-      form_set_error('ip', t('You may not ban your own IP address.'));
+    elseif ($ip == $this->getRequest()->getClientIP()) {
+      form_set_error('ip', $this->t('You may not ban your own IP address.'));
     }
     elseif (filter_var($ip, FILTER_VALIDATE_IP, FILTER_FLAG_NO_RES_RANGE) == FALSE) {
-      form_set_error('ip', t('Enter a valid IP address.'));
+      form_set_error('ip', $this->t('Enter a valid IP address.'));
     }
   }
 
@@ -130,7 +120,7 @@ public function validateForm(array &$form, array &$form_state) {
   public function submitForm(array &$form, array &$form_state) {
     $ip = trim($form_state['values']['ip']);
     $this->ipManager->banIp($ip);
-    drupal_set_message(t('The IP address %ip has been banned.', array('%ip' => $ip)));
+    drupal_set_message($this->t('The IP address %ip has been banned.', array('%ip' => $ip)));
     $form_state['redirect'] = 'admin/config/people/ban';
   }
 
diff --git a/core/modules/ban/lib/Drupal/ban/Form/BanDelete.php b/core/modules/ban/lib/Drupal/ban/Form/BanDelete.php
index 980c92b..d64a40f 100644
--- a/core/modules/ban/lib/Drupal/ban/Form/BanDelete.php
+++ b/core/modules/ban/lib/Drupal/ban/Form/BanDelete.php
@@ -7,7 +7,6 @@
 
 namespace Drupal\ban\Form;
 
-use Drupal\Core\Controller\ControllerInterface;
 use Drupal\Core\Form\ConfirmFormBase;
 use Drupal\ban\BanIpManager;
 use Symfony\Component\DependencyInjection\ContainerInterface;
@@ -16,7 +15,7 @@
 /**
  * Provides a form to unban IP addresses.
  */
-class BanDelete extends ConfirmFormBase implements ControllerInterface {
+class BanDelete extends ConfirmFormBase {
 
   /**
    * The banned IP address.
@@ -91,7 +90,7 @@ public function buildForm(array $form, array &$form_state, $ban_id = '') {
   public function submitForm(array &$form, array &$form_state) {
     $this->ipManager->unbanIp($this->banIp);
     watchdog('user', 'Deleted %ip', array('%ip' => $this->banIp));
-    drupal_set_message(t('The IP address %ip was deleted.', array('%ip' => $this->banIp)));
+    drupal_set_message($this->t('The IP address %ip was deleted.', array('%ip' => $this->banIp)));
     $form_state['redirect'] = 'admin/config/people/ban';
   }