Plupload:

- Update to 2.1.9.
- Include the non-minified plupload.js and moxie.js.
- Remove support for Flash and Silverlight, the available runtime options are `html5` and `html4`.
- Delete plupload.flash.swf and plupload.silverlight.xap.

Fixes #41755.

git-svn-id: https://develop.svn.wordpress.org/trunk@41328 602fd350-edb4-49c9-b593-d223f7449a82

src/wp-admin/includes/media.php

@@ -1868,15 +1868,16 @@ $post_params = array(
  */
 $post_params = apply_filters( 'upload_post_params', $post_params );
 
+/*
+ * Since 4.9 the `runtimes` setting is hardcoded in our version of Plupload to `html5,html4`,
+ * and the `flash_swf_url` and `silverlight_xap_url` are not used.
+ */
 $plupload_init = array(
-	'runtimes'            => 'html5,flash,silverlight,html4',
 	'browse_button'       => 'plupload-browse-button',
 	'container'           => 'plupload-upload-ui',
 	'drop_element'        => 'drag-drop-area',
 	'file_data_name'      => 'async-upload',
 	'url'                 => $upload_action_url,
-	'flash_swf_url'       => includes_url( 'js/plupload/plupload.flash.swf' ),
-	'silverlight_xap_url' => includes_url( 'js/plupload/plupload.silverlight.xap' ),
 	'filters' => array(
 		'max_file_size'   => $max_upload_size . 'b',
 	),

src/wp-admin/includes/update-core.php

@@ -712,6 +712,9 @@ $_old_files = array(
 'wp-includes/js/tinymce/skins/lightgray/fonts/tinymce-small.json',
 'wp-includes/js/tinymce/skins/lightgray/fonts/tinymce.json',
 'wp-includes/js/tinymce/skins/lightgray/skin.ie7.min.css',
+// 4.9
+'wp-includes/js/plupload/plupload.flash.swf',
+'wp-includes/js/plupload/plupload.silverlight.xap',
 );
 
 /**