Script Loader: Remove `importmap` polyfill.

The polyfill was added in [57492], but all browsers supported by WordPress already support import maps.

This not only disables the polyfill, but completely removes it as it was only added recently and there is no usage outside of core.

Props swissspidy, desrosj, luisherranz, gziolo.
Fixes #60970.
Built from https://develop.svn.wordpress.org/trunk@58952


git-svn-id: http://core.svn.wordpress.org/trunk@58348 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-includes/class-wp-script-modules.php

@@ -236,20 +236,6 @@ class WP_Script_Modules {
 	public function print_import_map() {
 		$import_map = $this->get_import_map();
 		if ( ! empty( $import_map['imports'] ) ) {
-			global $wp_scripts;
-			if ( isset( $wp_scripts ) ) {
-				wp_print_inline_script_tag(
-					wp_get_script_polyfill(
-						$wp_scripts,
-						array(
-							'HTMLScriptElement.supports && HTMLScriptElement.supports("importmap")' => 'wp-polyfill-importmap',
-						)
-					),
-					array(
-						'id' => 'wp-load-polyfill-importmap',
-					)
-				);
-			}
 			wp_print_inline_script_tag(
 				wp_json_encode( $import_map, JSON_HEX_TAG | JSON_HEX_AMP ),
 				array(

wp-includes/script-loader.php

@@ -96,7 +96,6 @@ function wp_default_packages_vendor( $scripts ) {
 		'lodash',
 		'wp-polyfill-fetch',
 		'wp-polyfill-formdata',
-		'wp-polyfill-importmap',
 		'wp-polyfill-node-contains',
 		'wp-polyfill-url',
 		'wp-polyfill-dom-rect',
@@ -122,7 +121,6 @@ function wp_default_packages_vendor( $scripts ) {
 		'wp-polyfill-object-fit'      => '2.3.5',
 		'wp-polyfill-inert'           => '3.1.2',
 		'wp-polyfill'                 => '3.15.0',
-		'wp-polyfill-importmap'       => '1.8.2',
 	);
 
 	foreach ( $vendor_scripts as $handle => $dependencies ) {

wp-includes/version.php

@@ -16,7 +16,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '6.7-alpha-58951';
+$wp_version = '6.7-alpha-58952';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.