diff --git a/core/modules/taxonomy/lib/Drupal/taxonomy/Plugin/views/argument_validator/Term.php b/core/modules/taxonomy/lib/Drupal/taxonomy/Plugin/views/argument_validator/Term.php
index fafe15d..b93aa87 100644
--- a/core/modules/taxonomy/lib/Drupal/taxonomy/Plugin/views/argument_validator/Term.php
+++ b/core/modules/taxonomy/lib/Drupal/taxonomy/Plugin/views/argument_validator/Term.php
@@ -182,7 +182,7 @@ function validate_argument($argument) {
     }
   }
 
-  function process_summary_arguments(&$args) {
+  public function processSummaryArguments(&$args) {
     $type = $this->options['type'];
     $transform = $this->options['transform'];
 
diff --git a/core/modules/user/lib/Drupal/user/Plugin/views/argument_validator/User.php b/core/modules/user/lib/Drupal/user/Plugin/views/argument_validator/User.php
index 929ed42..cc518c3 100644
--- a/core/modules/user/lib/Drupal/user/Plugin/views/argument_validator/User.php
+++ b/core/modules/user/lib/Drupal/user/Plugin/views/argument_validator/User.php
@@ -137,7 +137,7 @@ function validate_argument($argument) {
     return TRUE;
   }
 
-  function process_summary_arguments(&$args) {
+  public function processSummaryArguments(&$args) {
     // If the validation says the input is an username, we should reverse the
     // argument so it works for example for generation summary urls.
     $uids_arg_keys = array_flip($args);
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 a7c04a5..4d7d169 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
@@ -754,10 +754,10 @@ public function getDefaultArgument() {
    * For example, the validation plugin may want to alter an argument for use in
    * the URL.
    */
-  function process_summary_arguments(&$args) {
+  public function processSummaryArguments(&$args) {
     if ($this->options['validate']['type'] != 'none') {
       if (isset($this->validator) || $this->validator = $this->getPlugin('argument_validator')) {
-        $this->validator->process_summary_arguments($args);
+        $this->validator->processSummaryArguments($args);
       }
     }
   }
diff --git a/core/modules/views/lib/Drupal/views/Plugin/views/argument_validator/ArgumentValidatorPluginBase.php b/core/modules/views/lib/Drupal/views/Plugin/views/argument_validator/ArgumentValidatorPluginBase.php
index 0e33ad6..e7945dc 100644
--- a/core/modules/views/lib/Drupal/views/Plugin/views/argument_validator/ArgumentValidatorPluginBase.php
+++ b/core/modules/views/lib/Drupal/views/Plugin/views/argument_validator/ArgumentValidatorPluginBase.php
@@ -90,7 +90,7 @@ function validate_argument($arg) { return TRUE; }
    * for a faster query. But there are use cases where you want to use
    * the old value again, for example the summary.
    */
-  function process_summary_arguments(&$args) { }
+  public function processSummaryArguments(&$args) { }
 
 }
 
diff --git a/core/modules/views/views.theme.inc b/core/modules/views/views.theme.inc
index 10c771b..b72c70f 100644
--- a/core/modules/views/views.theme.inc
+++ b/core/modules/views/views.theme.inc
@@ -435,7 +435,7 @@ function template_preprocess_views_view_summary(&$vars) {
   foreach ($vars['rows'] as $id => $row) {
     $row_args[$id] = $argument->summaryArgument($row);
   }
-  $argument->process_summary_arguments($row_args);
+  $argument->processSummaryArguments($row_args);
 
   foreach ($vars['rows'] as $id => $row) {
     $vars['rows'][$id]->link = $argument->summaryName($row);
@@ -495,7 +495,7 @@ function template_preprocess_views_view_summary_unformatted(&$vars) {
   foreach ($vars['rows'] as $id => $row) {
     $row_args[$id] = $argument->summaryArgument($row);
   }
-  $argument->process_summary_arguments($row_args);
+  $argument->processSummaryArguments($row_args);
 
   foreach ($vars['rows'] as $id => $row) {
     // Only false on first time.