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wp-includes/customize/class-wp-customize-background-image-setting.php

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+<?php
+/**
+ * Customize API: WP_Customize_Background_Image_Setting class
+ *
+ * @package WordPress
+ * @subpackage Customize
+ * @since 4.4.0
+ */
+
+/**
+ * Customizer Background Image Setting class.
+ *
+ * @since 3.4.0
+ *
+ * @see WP_Customize_Setting
+ */
+final class WP_Customize_Background_Image_Setting extends WP_Customize_Setting {
+
+	/**
+	 * Unique string identifier for the setting.
+	 *
+	 * @since 3.4.0
+	 * @var string
+	 */
+	public $id = 'background_image_thumb';
+
+	/**
+	 * @since 3.4.0
+	 *
+	 * @param mixed $value The value to update. Not used.
+	 */
+	public function update( $value ) {
+		remove_theme_mod( 'background_image_thumb' );
+	}
+}