WordPress: delete unwanted capabilities

script.php

<?php
// Function to delete capabilities
// http://chrisburbridge.com/delete-unwanted-wordpress-custom-capabilities/
add_action( 'admin_init', 'clean_unwanted_caps' );
function clean_unwanted_caps() {

  global $wp_roles;

  $delete_caps = array(
    'capability1'
  );

  foreach ($delete_caps as $cap) {
    foreach (array_keys($wp_roles->roles) as $role) {
      $wp_roles->remove_cap($role, $cap);
    }
  }

}