diff --git a/core/modules/comment/lib/Drupal/comment/Plugin/views/argument/UserUid.php b/core/modules/comment/lib/Drupal/comment/Plugin/views/argument/UserUid.php
index 5ff1fe6..8f55340 100644
--- a/core/modules/comment/lib/Drupal/comment/Plugin/views/argument/UserUid.php
+++ b/core/modules/comment/lib/Drupal/comment/Plugin/views/argument/UserUid.php
@@ -37,17 +37,17 @@ function title() {
     return check_plain($title);
   }
 
-  function default_actions($which = NULL) {
+  public function defaultActions($which = NULL) {
     // Disallow summary views on this argument.
     if (!$which) {
-      $actions = parent::default_actions();
+      $actions = parent::defaultActions();
       unset($actions['summary asc']);
       unset($actions['summary desc']);
       return $actions;
     }
 
     if ($which != 'summary asc' && $which != 'summary desc') {
-      return parent::default_actions($which);
+      return parent::defaultActions($which);
     }
   }
 
diff --git a/core/modules/taxonomy/lib/Drupal/taxonomy/Plugin/views/argument/IndexTidDepth.php b/core/modules/taxonomy/lib/Drupal/taxonomy/Plugin/views/argument/IndexTidDepth.php
index 7c5a0eb..145807c 100644
--- a/core/modules/taxonomy/lib/Drupal/taxonomy/Plugin/views/argument/IndexTidDepth.php
+++ b/core/modules/taxonomy/lib/Drupal/taxonomy/Plugin/views/argument/IndexTidDepth.php
@@ -78,16 +78,16 @@ function set_breadcrumb(&$breadcrumb) {
   }
 
   /**
-   * Override default_actions() to remove summary actions.
+   * Override defaultActions() to remove summary actions.
    */
-  function default_actions($which = NULL) {
+  function defaultActions($which = NULL) {
     if ($which) {
       if (in_array($which, array('ignore', 'not found', 'empty', 'default'))) {
-        return parent::default_actions($which);
+        return parent::defaultActions($which);
       }
       return;
     }
-    $actions = parent::default_actions();
+    $actions = parent::defaultActions();
     unset($actions['summary asc']);
     unset($actions['summary desc']);
     unset($actions['summary asc by count']);
diff --git a/core/modules/views/lib/Drupal/views/Plugin/views/argument/ArgumentPluginBase.php b/core/modules/views/lib/Drupal/views/Plugin/views/argument/ArgumentPluginBase.php
index 655a90a..a8e7da0 100644
--- a/core/modules/views/lib/Drupal/views/Plugin/views/argument/ArgumentPluginBase.php
+++ b/core/modules/views/lib/Drupal/views/Plugin/views/argument/ArgumentPluginBase.php
@@ -92,7 +92,7 @@ function set_breadcrumb(&$breadcrumb) { }
    * @return TRUE/FALSE
    */
   public function usesBreadcrumb() {
-    $info = $this->default_actions($this->options['default_action']);
+    $info = $this->defaultActions($this->options['default_action']);
     return !empty($info['breadcrumb']);
   }
 
@@ -117,8 +117,8 @@ function exception_title() {
    * @return TRUE/FALSE
    */
   public function needsStylePlugin() {
-    $info = $this->default_actions($this->options['default_action']);
-    $validate_info = $this->default_actions($this->options['validate']['fail']);
+    $info = $this->defaultActions($this->options['default_action']);
+    $validate_info = $this->defaultActions($this->options['validate']['fail']);
     return !empty($info['style plugin']) || !empty($validate_info['style plugin']);
   }
 
@@ -223,7 +223,7 @@ public function buildOptionsForm(&$form, &$form_state) {
     );
 
     $options = array();
-    $defaults = $this->default_actions();
+    $defaults = $this->defaultActions();
     $validate_options = array();
     foreach ($defaults as $id => $info) {
       $options[$id] = $info['title'];
@@ -440,7 +440,7 @@ public function submitOptionsForm(&$form, &$form_state) {
    *
    * Override this method to provide additional (or fewer) default behaviors.
    */
-  function default_actions($which = NULL) {
+  function defaultActions($which = NULL) {
     $defaults = array(
       'ignore' => array(
         'title' => t('Display all results for the specified field'),
@@ -653,7 +653,7 @@ public function defaultSummaryForm(&$form, &$form_state) {
    */
   function default_action($info = NULL) {
     if (!isset($info)) {
-      $info = $this->default_actions($this->options['default_action']);
+      $info = $this->defaultActions($this->options['default_action']);
     }
 
     if (!$info) {
@@ -672,7 +672,7 @@ function default_action($info = NULL) {
    * How to act if validation failes
    */
   public function validateFail() {
-    $info = $this->default_actions($this->options['validate']['fail']);
+    $info = $this->defaultActions($this->options['validate']['fail']);
     return $this->default_action($info);
   }
   /**
@@ -734,7 +734,7 @@ function default_default() {
    * Determine if the argument is set to provide a default argument.
    */
   function hasDefaultArgument() {
-    $info = $this->default_actions($this->options['default_action']);
+    $info = $this->defaultActions($this->options['default_action']);
     return !empty($info['has default argument']);
   }
 
@@ -961,7 +961,7 @@ public function validateArgument($arg) {
    * then validation cannot actually fail.
    */
   function validate_argument($arg) {
-    $validate_info = $this->default_actions($this->options['validate']['fail']);
+    $validate_info = $this->defaultActions($this->options['validate']['fail']);
     if (empty($validate_info['hard fail'])) {
       return TRUE;
     }
@@ -970,7 +970,7 @@ function validate_argument($arg) {
 
     // If the validator has changed the validate fail condition to a
     // soft fail, deal with that:
-    $validate_info = $this->default_actions($this->options['validate']['fail']);
+    $validate_info = $this->defaultActions($this->options['validate']['fail']);
     if (empty($validate_info['hard fail'])) {
       return TRUE;
     }
diff --git a/core/modules/views/lib/Drupal/views/Plugin/views/argument/Null.php b/core/modules/views/lib/Drupal/views/Plugin/views/argument/Null.php
index 31e04b0..a486525 100644
--- a/core/modules/views/lib/Drupal/views/Plugin/views/argument/Null.php
+++ b/core/modules/views/lib/Drupal/views/Plugin/views/argument/Null.php
@@ -42,17 +42,17 @@ public function buildOptionsForm(&$form, &$form_state) {
   }
 
   /**
-   * Override default_actions() to remove actions that don't
+   * Override defaultActions() to remove actions that don't
    * make sense for a null argument.
    */
-  function default_actions($which = NULL) {
+  function defaultActions($which = NULL) {
     if ($which) {
       if (in_array($which, array('ignore', 'not found', 'empty', 'default'))) {
-        return parent::default_actions($which);
+        return parent::defaultActions($which);
       }
       return;
     }
-    $actions = parent::default_actions();
+    $actions = parent::defaultActions();
     unset($actions['summary asc']);
     unset($actions['summary desc']);
     return $actions;