Update some of the debug messages.

lib/Drupal/views/Plugin/views/style/Rss.php

@@ -105,7 +105,7 @@ function get_description() {
 
   function render() {
     if (empty($this->row_plugin)) {
-      vpr('views_plugin_style_default: Missing row plugin');
+      vpr('Drupal\views\Plugin\views\style\Rss: Missing row plugin');
       return;
     }
     $rows = '';

lib/Drupal/views/Plugin/views/style/StylePluginBase.php

@@ -324,7 +324,7 @@ function pre_render($result) {
    */
   function render() {
     if ($this->uses_row_plugin() && empty($this->row_plugin)) {
-      debug('views_plugin_style_default: Missing row plugin');
+      vpr('Drupal\views\Plugin\views\style\StylePluginBase: Missing row plugin');
       return;
     }