(ACTUALLY) Eliminate use of `extract()` in `WP_Comment_Query::query()`.

See #22400.


git-svn-id: https://develop.svn.wordpress.org/trunk@28459 602fd350-edb4-49c9-b593-d223f7449a82

src/wp-includes/comment.php

@@ -274,7 +274,6 @@ class WP_Comment_Query {
 		 * @param WP_Comment_Query &$this Current instance of WP_Comment_Query, passed by reference.
 		 */
 		do_action_ref_array( 'pre_get_comments', array( &$this ) );
-		extract( $this->query_vars, EXTR_SKIP );
 
 		// $args can be whatever, only use the args defined in defaults to compute the key
 		$key = md5( serialize( compact( array_keys( $defaults ) ) )  );