Source

File: wp-admin/includes/class-wp-media-list-table.php

public function column_comments( $post ) {
		echo '<div class="post-com-count-wrapper">';

		if ( isset( $this->comment_pending_count[ $post->ID ] ) ) {
			$pending_comments = $this->comment_pending_count[ $post->ID ];
		} else {
			$pending_comments = get_pending_comments_num( $post->ID );
		}

		$this->comments_bubble( $post->ID, $pending_comments );

		echo '</div>';
	}