'show' variable removed from admin_block theme hook

Summary

The 'show' variable has been removed from the admin_block theme hook. The ability to hide the output of this (or any) theme hook can be accomplished by adding #access => FALSE in a render array.

Before

$block = array();
$block['title'] = $module;
$block['content'] = drupal_render($admin_block_content);
$block['description'] = t($description);
$block['show'] = FALSE;

$admin_block = array(
  '#theme' => 'admin_block',
  '#block' => $block,
);

After

$block = array();
$block['title'] = $module;
$block['content'] = drupal_render($admin_block_content);
$block['description'] = t($description);

$admin_block = array(
  '#theme' => 'admin_block',
  '#block' => $block,
  '#access' => FALSE,
);