Views classes redundant since Views 6.x-2.9

Issue #682888: $classes for views-view.tpl.php introduced in views-6.x-2.9 in template_preprocess_views_view() the following:

  // Basic classes
  $vars['classes_array'] = array();
  $vars['classes_array'][] = 'view';
  $vars['classes_array'][] = 'view-' . views_css_safe($vars['name']);
  $vars['classes_array'][] = 'view-id-' . $vars['name'];
  $vars['classes_array'][] = 'view-display-id-' . $vars['display_id'];

based on zen itself, making most of zen_preprocess_views_view() redundant.
Attached patch removes duplicates, but preserves functionality for views older than 2.9, maybe they should be removed altogether ?