Add node delete links to tabs and context menus in Drupal 7.

mysite.module

/**
 * Implements hook_menu_alter().
 */
function mysite_menu_alter(&$items) {
  $items['node/%node/delete']['type'] = MENU_LOCAL_TASK;
  $items['node/%node/delete']['context'] = MENU_CONTEXT_PAGE | MENU_CONTEXT_INLINE;
}