diff --git a/core/modules/node/lib/Drupal/node/Plugin/views/field/NodeBulkForm.php b/core/modules/node/lib/Drupal/node/Plugin/views/field/NodeBulkForm.php
index 4ae0bef..ff96a30 100644
--- a/core/modules/node/lib/Drupal/node/Plugin/views/field/NodeBulkForm.php
+++ b/core/modules/node/lib/Drupal/node/Plugin/views/field/NodeBulkForm.php
@@ -34,18 +34,18 @@ public function __construct(array $configuration, $plugin_id, array $plugin_defi
   /**
    * {@inheritdoc}
    */
-  public function views_form_validate(&$form, &$form_state) {
+  public function viewsFormValidate(&$form, &$form_state) {
     $selected = array_filter($form_state['values'][$this->options['id']]);
     if (empty($selected)) {
-      form_set_error('', t('No items selected.'));
+      \Drupal::formBuilder()->setErrorByName('', $this->t('No items selected.'));
     }
   }
 
   /**
    * {@inheritdoc}
    */
-  public function views_form_submit(&$form, &$form_state) {
-    parent::views_form_submit($form, $form_state);
+  public function viewsFormSubmit(&$form, &$form_state) {
+    parent::viewsFormSubmit($form, $form_state);
     if ($form_state['step'] == 'views_form_views_form') {
       Cache::invalidateTags(array('content' => TRUE));
     }
diff --git a/core/modules/system/lib/Drupal/system/Plugin/views/field/BulkFormBase.php b/core/modules/system/lib/Drupal/system/Plugin/views/field/BulkFormBase.php
index 847aee7..2ffc6f8 100644
--- a/core/modules/system/lib/Drupal/system/Plugin/views/field/BulkFormBase.php
+++ b/core/modules/system/lib/Drupal/system/Plugin/views/field/BulkFormBase.php
@@ -81,7 +81,7 @@ public function preRender(&$values) {
    * @param array $form_state
    *   An associative array containing the current state of the form.
    */
-  public function views_form(&$form, &$form_state) {
+  public function viewsForm(&$form, &$form_state) {
     // Add the tableselect javascript.
     $form['#attached']['library'][] = array('system', 'drupal.tableselect');
 
@@ -149,7 +149,7 @@ protected function getBulkOptions() {
    * @param array $form_state
    *   An associative array containing the current state of the form.
    */
-  public function views_form_submit(&$form, &$form_state) {
+  public function viewsFormSubmit(&$form, &$form_state) {
     if ($form_state['step'] == 'views_form_views_form') {
       // Filter only selected checkboxes.
       $selected = array_filter($form_state['values'][$this->options['id']]);
diff --git a/core/modules/user/lib/Drupal/user/Plugin/views/field/UserBulkForm.php b/core/modules/user/lib/Drupal/user/Plugin/views/field/UserBulkForm.php
index 8e9ed6e..5adbb5b 100644
--- a/core/modules/user/lib/Drupal/user/Plugin/views/field/UserBulkForm.php
+++ b/core/modules/user/lib/Drupal/user/Plugin/views/field/UserBulkForm.php
@@ -36,10 +36,10 @@ public function __construct(array $configuration, $plugin_id, array $plugin_defi
   /**
    * {@inheritdoc}
    *
-   * Provide a more useful title to improve the accessibility.
+   * @todo Provide a more useful title to improve the accessibility.
    */
-  public function views_form(&$form, &$form_state) {
-    parent::views_form($form, $form_state);
+  public function viewsForm(&$form, &$form_state) {
+    parent::viewsForm($form, $form_state);
 
     if (!empty($this->view->result)) {
       foreach ($this->view->result as $row_index => $result) {
@@ -54,10 +54,10 @@ public function views_form(&$form, &$form_state) {
   /**
    * {@inheritdoc}
    */
-  public function views_form_validate(&$form, &$form_state) {
+  public function viewsFormValidate(&$form, &$form_state) {
     $selected = array_filter($form_state['values'][$this->options['id']]);
     if (empty($selected)) {
-      form_set_error('', t('No users selected.'));
+      \Drupal::formBuilder()->setErrorByName('', $this->t('No users selected.'));
     }
   }
 
diff --git a/core/modules/views/lib/Drupal/views/Plugin/views/field/ActionBulkForm.php b/core/modules/views/lib/Drupal/views/Plugin/views/field/ActionBulkForm.php
index ba2356c..3437ef0 100644
--- a/core/modules/views/lib/Drupal/views/Plugin/views/field/ActionBulkForm.php
+++ b/core/modules/views/lib/Drupal/views/Plugin/views/field/ActionBulkForm.php
@@ -98,10 +98,10 @@ protected function getBulkOptions($filtered = TRUE) {
   }
 
   /**
-   * Implements \Drupal\system\Plugin\views\field\BulkFormBase::views_form_submit().
+   * {@inheritdoc}
    */
-  public function views_form_submit(&$form, &$form_state) {
-    parent::views_form_submit($form, $form_state);
+  public function viewsFormSubmit(&$form, &$form_state) {
+    parent::viewsFormSubmit($form, $form_state);
     if ($form_state['step'] == 'views_form_views_form') {
       $count = count(array_filter($form_state['values'][$this->options['id']]));
       $action = $this->actions[$form_state['values']['action']];
diff --git a/core/modules/views/views.module b/core/modules/views/views.module
index edc5ec1..de12238 100644
--- a/core/modules/views/views.module
+++ b/core/modules/views/views.module
@@ -1022,14 +1022,14 @@ function views_get_view($name) {
  */
 function views_view_has_form_elements($view) {
   foreach ($view->field as $field) {
-    if (property_exists($field, 'views_form_callback') || method_exists($field, 'views_form')) {
+    if (property_exists($field, 'views_form_callback') || method_exists($field, 'viewsForm')) {
       return TRUE;
     }
   }
   $area_handlers = array_merge(array_values($view->header), array_values($view->footer));
   $empty = empty($view->result);
   foreach ($area_handlers as $area) {
-    if (method_exists($area, 'views_form') && !$area->views_form_empty($empty)) {
+    if (method_exists($area, 'viewsForm') && !$area->viewsFormEmpty($empty)) {
       return TRUE;
     }
   }
@@ -1095,11 +1095,11 @@ function views_form_views_form($form, &$form_state, ViewExecutable $view, $outpu
   $substitutions = array();
   foreach ($view->field as $field_name => $field) {
     $form_element_name = $field_name;
-    if (method_exists($field, 'form_element_name')) {
-      $form_element_name = $field->form_element_name();
+    if (method_exists($field, 'formElementName')) {
+      $form_element_name = $field->formElementName();
     }
     $method_form_element_row_id_exists = FALSE;
-    if (method_exists($field, 'form_element_row_id')) {
+    if (method_exists($field, 'formElementRowId')) {
       $method_form_element_row_id_exists = TRUE;
     }
 
@@ -1110,8 +1110,8 @@ function views_form_views_form($form, &$form_state, ViewExecutable $view, $outpu
       $callback($view, $field, $form, $form_state);
       $has_form = TRUE;
     }
-    elseif (method_exists($field, 'views_form')) {
-      $field->views_form($form, $form_state);
+    elseif (method_exists($field, 'viewsForm')) {
+      $field->viewsForm($form, $form_state);
       $has_form = TRUE;
     }
 
@@ -1119,7 +1119,7 @@ function views_form_views_form($form, &$form_state, ViewExecutable $view, $outpu
     if ($has_form) {
       foreach ($view->result as $row_id => $row) {
         if ($method_form_element_row_id_exists) {
-          $form_element_row_id = $field->form_element_row_id($row_id);
+          $form_element_row_id = $field->formElementRowId($row_id);
         }
         else {
           $form_element_row_id = $row_id;
@@ -1138,8 +1138,8 @@ function views_form_views_form($form, &$form_state, ViewExecutable $view, $outpu
   $area_handlers = array_merge(array_values($view->header), array_values($view->footer));
   $empty = empty($view->result);
   foreach ($area_handlers as $area) {
-    if (method_exists($area, 'views_form') && !$area->views_form_empty($empty)) {
-      $area->views_form($form, $form_state);
+    if (method_exists($area, 'viewsForm') && !$area->viewsFormEmpty($empty)) {
+      $area->viewsForm($form, $form_state);
     }
   }
 
@@ -1161,16 +1161,16 @@ function views_form_views_form_validate($form, &$form_state) {
 
   // Call the validation method on every field handler that has it.
   foreach ($view->field as $field) {
-    if (method_exists($field, 'views_form_validate')) {
-      $field->views_form_validate($form, $form_state);
+    if (method_exists($field, 'viewsFormValidate')) {
+      $field->viewsFormValidate($form, $form_state);
     }
   }
 
   // Call the validate method on every area handler that has it.
   foreach (array('header', 'footer') as $area) {
     foreach ($view->{$area} as $area_handler) {
-      if (method_exists($area_handler, 'views_form_validate')) {
-        $area_handler->views_form_validate($form, $form_state);
+      if (method_exists($area_handler, 'viewsFormValidate')) {
+        $area_handler->viewsFormValidate($form, $form_state);
       }
     }
   }
@@ -1186,16 +1186,16 @@ function views_form_views_form_submit($form, &$form_state) {
 
   // Call the submit method on every field handler that has it.
   foreach ($view->field as $field) {
-    if (method_exists($field, 'views_form_submit')) {
-      $field->views_form_submit($form, $form_state);
+    if (method_exists($field, 'viewsFormSubmit')) {
+      $field->viewsFormSubmit($form, $form_state);
     }
   }
 
   // Call the submit method on every area handler that has it.
   foreach (array('header', 'footer') as $area) {
     foreach ($view->{$area} as $area_handler) {
-      if (method_exists($area_handler, 'views_form_submit')) {
-        $area_handler->views_form_submit($form, $form_state);
+      if (method_exists($area_handler, 'viewsFormSubmit')) {
+        $area_handler->viewsFormSubmit($form, $form_state);
       }
     }
   }