Index: src/wp-admin/includes/template.php
===================================================================
--- src/wp-admin/includes/template.php	(revision 39054)
+++ src/wp-admin/includes/template.php	(working copy)
@@ -1945,9 +1945,6 @@
 	// Remove empty items, remove duplicate items, and finally build a string.
 	$class = implode( ' ', array_unique( array_filter( $classes ) ) );
 
-	if ( 'delete' === $type )
-		$class = 'button delete';
-
 	$text = $text ? $text : __( 'Save Changes' );
 
 	// Default the id attribute to $name unless an id was specifically provided in $other_attributes