diff --git a/core/modules/views/lib/Drupal/views/Plugin/views/filter/InOperator.php b/core/modules/views/lib/Drupal/views/Plugin/views/filter/InOperator.php
index eaf564c..c37bd48 100644
--- a/core/modules/views/lib/Drupal/views/Plugin/views/filter/InOperator.php
+++ b/core/modules/views/lib/Drupal/views/Plugin/views/filter/InOperator.php
@@ -153,7 +153,7 @@ public function operatorOptions($which = 'title') {
     return $options;
   }
 
-  function operator_values($values = 1) {
+  protected function operatorValues($values = 1) {
     $options = array();
     foreach ($this->operators() as $id => $info) {
       if (isset($info['values']) && $info['values'] == $values) {
@@ -186,7 +186,7 @@ function value_form(&$form, &$form_state) {
 
       if (empty($this->options['expose']['use_operator']) || empty($this->options['expose']['operator_id'])) {
         // exposed and locked.
-        $which = in_array($this->operator, $this->operator_values(1)) ? 'value' : 'none';
+        $which = in_array($this->operator, $this->operatorValues(1)) ? 'value' : 'none';
       }
       else {
         $source = ':input[name="' . $this->options['expose']['operator_id'] . '"]';
@@ -235,7 +235,7 @@ function value_form(&$form, &$form_state) {
           $form['value']['#suffix'] = '</div>';
         }
         // Setup #states for all operators with one value.
-        foreach ($this->operator_values(1) as $operator) {
+        foreach ($this->operatorValues(1) as $operator) {
           $form['value']['#states']['visible'][] = array(
             $source => array('value' => $operator),
           );
@@ -324,7 +324,7 @@ public function adminSummary() {
 
     $operator = check_plain($info[$this->operator]['short']);
     $values = '';
-    if (in_array($this->operator, $this->operator_values(1))) {
+    if (in_array($this->operator, $this->operatorValues(1))) {
       // Remove every element which is not known.
       foreach ($this->value as $value) {
         if (!isset($this->value_options[$value])) {
@@ -405,11 +405,11 @@ public function validate() {
 
     // If the operator is an operator which doesn't require a value, there is
     // no need for additional validation.
-    if (in_array($this->operator, $this->operator_values(0))) {
+    if (in_array($this->operator, $this->operatorValues(0))) {
       return array();
     }
 
-    if (!in_array($this->operator, $this->operator_values(1))) {
+    if (!in_array($this->operator, $this->operatorValues(1))) {
       $errors[] = t('The operator is invalid on filter: @filter.', array('@filter' => $this->adminLabel(TRUE)));
     }
     if (is_array($this->value)) {
diff --git a/core/modules/views/lib/Drupal/views/Plugin/views/filter/Numeric.php b/core/modules/views/lib/Drupal/views/Plugin/views/filter/Numeric.php
index c9d5389..2a97c25 100644
--- a/core/modules/views/lib/Drupal/views/Plugin/views/filter/Numeric.php
+++ b/core/modules/views/lib/Drupal/views/Plugin/views/filter/Numeric.php
@@ -132,7 +132,7 @@ public function operatorOptions($which = 'title') {
     return $options;
   }
 
-  function operator_values($values = 1) {
+  protected function operatorValues($values = 1) {
     $options = array();
     foreach ($this->operators() as $id => $info) {
       if ($info['values'] == $values) {
@@ -162,7 +162,7 @@ function value_form(&$form, &$form_state) {
 
       if (empty($this->options['expose']['use_operator']) || empty($this->options['expose']['operator_id'])) {
         // exposed and locked.
-        $which = in_array($this->operator, $this->operator_values(2)) ? 'minmax' : 'value';
+        $which = in_array($this->operator, $this->operatorValues(2)) ? 'minmax' : 'value';
       }
       else {
         $source = ':input[name="' . $this->options['expose']['operator_id'] . '"]';
@@ -177,7 +177,7 @@ function value_form(&$form, &$form_state) {
         '#default_value' => $this->value['value'],
       );
       // Setup #states for all operators with one value.
-      foreach ($this->operator_values(1) as $operator) {
+      foreach ($this->operatorValues(1) as $operator) {
         $form['value']['value']['#states']['visible'][] = array(
           $source => array('value' => $operator),
         );
@@ -216,7 +216,7 @@ function value_form(&$form, &$form_state) {
       if ($which == 'all') {
         $states = array();
         // Setup #states for all operators with two values.
-        foreach ($this->operator_values(2) as $operator) {
+        foreach ($this->operatorValues(2) as $operator) {
           $states['#states']['visible'][] = array(
             $source => array('value' => $operator),
           );
@@ -289,10 +289,10 @@ public function adminSummary() {
 
     $options = $this->operatorOptions('short');
     $output = check_plain($options[$this->operator]);
-    if (in_array($this->operator, $this->operator_values(2))) {
+    if (in_array($this->operator, $this->operatorValues(2))) {
       $output .= ' ' . t('@min and @max', array('@min' => $this->value['min'], '@max' => $this->value['max']));
     }
-    elseif (in_array($this->operator, $this->operator_values(1))) {
+    elseif (in_array($this->operator, $this->operatorValues(1))) {
       $output .= ' ' . check_plain($this->value['value']);
     }
     return $output;
diff --git a/core/modules/views/lib/Drupal/views/Plugin/views/filter/String.php b/core/modules/views/lib/Drupal/views/Plugin/views/filter/String.php
index c71e14b..f94e966 100644
--- a/core/modules/views/lib/Drupal/views/Plugin/views/filter/String.php
+++ b/core/modules/views/lib/Drupal/views/Plugin/views/filter/String.php
@@ -168,13 +168,13 @@ public function adminSummary() {
     if (!empty($options[$this->operator])) {
       $output = check_plain($options[$this->operator]);
     }
-    if (in_array($this->operator, $this->operator_values(1))) {
+    if (in_array($this->operator, $this->operatorValues(1))) {
       $output .= ' ' . check_plain($this->value);
     }
     return $output;
   }
 
-  function operator_values($values = 1) {
+  protected function operatorValues($values = 1) {
     $options = array();
     foreach ($this->operators() as $id => $info) {
       if (isset($info['values']) && $info['values'] == $values) {
@@ -202,7 +202,7 @@ function value_form(&$form, &$form_state) {
 
       if (empty($this->options['expose']['use_operator']) || empty($this->options['expose']['operator_id'])) {
         // exposed and locked.
-        $which = in_array($this->operator, $this->operator_values(1)) ? 'value' : 'none';
+        $which = in_array($this->operator, $this->operatorValues(1)) ? 'value' : 'none';
       }
       else {
         $source = ':input[name="' . $this->options['expose']['operator_id'] . '"]';
@@ -222,7 +222,7 @@ function value_form(&$form, &$form_state) {
 
       if ($which == 'all') {
         // Setup #states for all operators with one value.
-        foreach ($this->operator_values(1) as $operator) {
+        foreach ($this->operatorValues(1) as $operator) {
           $form['value']['#states']['visible'][] = array(
             $source => array('value' => $operator),
           );