REST API: Update Global styles revisions private methods to protected.

This changeset updates the private vars and methods in the Global styles revisions rest API controller to be protected, so class entities that inherit 
from the base can use them, and to allow iterating on 6.3 features without having to copy over private methods to new classes.

Props ramonopoly.
Fixes #58846.




git-svn-id: https://develop.svn.wordpress.org/trunk@56268 602fd350-edb4-49c9-b593-d223f7449a82

Author: audrasjb

src/wp-includes/rest-api/endpoints/class-wp-rest-global-styles-revisions-controller.php

@@ -21,15 +21,15 @@ class WP_REST_Global_Styles_Revisions_Controller extends WP_REST_Controller {
 	 * @since 6.3.0
 	 * @var string
 	 */
-	private $parent_post_type;
+	protected $parent_post_type;
 
 	/**
 	 * The base of the parent controller's route.
 	 *
 	 * @since 6.3.0
 	 * @var string
 	 */
-	private $parent_base;
+	protected $parent_base;
 
 	/**
 	 * Constructor.
@@ -102,7 +102,7 @@ public function get_collection_params() {
 	 * @param string $raw_json Encoded JSON from global styles custom post content.
 	 * @return Array|WP_Error
 	 */
-	private function get_decoded_global_styles_json( $raw_json ) {
+	protected function get_decoded_global_styles_json( $raw_json ) {
 		$decoded_json = json_decode( $raw_json, true );
 
 		if ( is_array( $decoded_json ) && isset( $decoded_json['isGlobalStylesUserThemeJSON'] ) && true === $decoded_json['isGlobalStylesUserThemeJSON'] ) {