Widgets: Remove `WP_Widget_Factory::$hashed_class_counts` property, unused since [46220].

The `spl_object_hash()` function was introduced in PHP 5.2.0. As of PHP 5.3, the PHP SPL extension can no longer be disabled, so the `WP_Widget_Factory::hash_object()` workaround was removed in [46220].

See #48074.
Built from https://develop.svn.wordpress.org/trunk@46808


git-svn-id: http://core.svn.wordpress.org/trunk@46608 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-includes/class-wp-widget-factory.php

@@ -45,19 +45,6 @@ class WP_Widget_Factory {
 		self::__construct();
 	}
 
-	/**
-	 * Memory for the number of times unique class instances have been hashed.
-	 *
-	 * This can be eliminated in favor of straight spl_object_hash() when 5.3
-	 * is the minimum requirement for PHP.
-	 *
-	 * @since 4.6.0
-	 * @var array
-	 *
-	 * @see WP_Widget_Factory::hash_object()
-	 */
-	private $hashed_class_counts = array();
-
 	/**
 	 * Registers a widget subclass.
 	 *

wp-includes/version.php

@@ -13,7 +13,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '5.4-alpha-46807';
+$wp_version = '5.4-alpha-46808';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.