Issue #2002398 by web.dev.cas: Rename Views method cache_flush() to cacheFlush().

core/modules/views/lib/Drupal/views/Plugin/views/cache/CachePluginBase.php

@@ -180,7 +180,7 @@ function cache_get($type) {
    * We're just going to nuke anything related to the view, regardless of display,
    * to be sure that we catch everything. Maybe that's a bad idea.
    */
-  function cache_flush() {
+  public function cacheFlush() {
     cache($this->table)->deleteTags(array($this->view->storage->id() => TRUE));
   }
 

core/modules/views/lib/Drupal/views/Plugin/views/display/DisplayPluginBase.php

@@ -2146,7 +2146,7 @@ public function submitOptionsForm(&$form, &$form_state) {
     // Not sure I like this being here, but it seems (?) like a logical place.
     $cache_plugin = $this->getPlugin('cache');
     if ($cache_plugin) {
-      $cache_plugin->cache_flush();
+      $cache_plugin->cacheFlush();
     }
 
     $section = $form_state['section'];