Resolve #2852463 "Configurable trait and base"

Closes #2852463

core/lib/Drupal/Core/Action/ConfigurableActionBase.php

@@ -5,6 +5,7 @@
 use Drupal\Component\Plugin\ConfigurableInterface;
 use Drupal\Component\Plugin\DependentPluginInterface;
 use Drupal\Core\Form\FormStateInterface;
+use Drupal\Core\Plugin\ConfigurableTrait;
 use Drupal\Core\Plugin\PluginFormInterface;
 
 /**
@@ -12,6 +13,8 @@
  */
 abstract class ConfigurableActionBase extends ActionBase implements ConfigurableInterface, DependentPluginInterface, PluginFormInterface {
 
+  use ConfigurableTrait;
+
   /**
    * {@inheritdoc}
    */
@@ -21,27 +24,6 @@ public function __construct(array $configuration, $plugin_id, $plugin_definition
     $this->setConfiguration($configuration);
   }
 
-  /**
-   * {@inheritdoc}
-   */
-  public function defaultConfiguration() {
-    return [];
-  }
-
-  /**
-   * {@inheritdoc}
-   */
-  public function getConfiguration() {
-    return $this->configuration;
-  }
-
-  /**
-   * {@inheritdoc}
-   */
-  public function setConfiguration(array $configuration) {
-    $this->configuration = $configuration + $this->defaultConfiguration();
-  }
-
   /**
    * {@inheritdoc}
    */