These functions import $wpdb but do not use it.

See #27882.


git-svn-id: https://develop.svn.wordpress.org/trunk@28539 602fd350-edb4-49c9-b593-d223f7449a82

src/wp-includes/taxonomy.php

@@ -3161,8 +3161,6 @@ function wp_update_term_count( $terms, $taxonomy, $do_deferred=false ) {
  * @return bool Always true when complete.
  */
 function wp_update_term_count_now( $terms, $taxonomy ) {
-	global $wpdb;
-
 	$terms = array_map('intval', $terms);
 
 	$taxonomy = get_taxonomy($taxonomy);