Uploader: enable selecting multiple files on mobile devices (still doesn't work on Android). See #28640.

Built from https://develop.svn.wordpress.org/trunk@28847


git-svn-id: http://core.svn.wordpress.org/trunk@28651 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-admin/includes/media.php

@@ -1772,11 +1772,6 @@ $plupload_init = array(
 	'multipart_params'    => $post_params,
 );
 
-// Multi-file uploading doesn't currently work in iOS Safari,
-// single-file allows the built-in camera to be used as source for images
-if ( wp_is_mobile() )
-	$plupload_init['multi_selection'] = false;
-
 /**
  * Filter the default Plupload settings.
  *