title: How to delete or unset a cookie when the browser is closed?
body: <p>I set following cookie when user open the site</p>
  
  <pre><code>add_action('init', 'is_it_mobile_or_desktop', 1);
      function is_it_mobile_or_desktop(){
          if (isset($_GET['site']) &amp;&amp; in_array($_GET['site'], array('mobile', 'desktop'))){
              setcookie( 'site', $_GET['site'], time() + 3600, COOKIEPATH, COOKIE_DOMAIN);
          }
      }
  
  add_action('init', 'who_am_i', 2);
  </code></pre>
  
  <p>Now I want to unset/delete this cookie when the user closes the browser (Not the tab)</p>
  
  <p>How can I do that?</p>