diff --git a/core/includes/bootstrap.inc b/core/includes/bootstrap.inc
index 1568f45..f33d22b 100644
--- a/core/includes/bootstrap.inc
+++ b/core/includes/bootstrap.inc
@@ -816,124 +816,6 @@ function settings() {
 }
 
 /**
- * Loads the persistent variable table.
- *
- * The variable table is composed of values that have been saved in the table
- * with variable_set() as well as those explicitly specified in the
- * configuration file.
- */
-function variable_initialize($conf = array()) {
-  // NOTE: caching the variables improves performance by 20% when serving
-  // cached pages.
-  if ($cached = cache('bootstrap')->get('variables')) {
-    $variables = $cached->data;
-  }
-  else {
-    // Cache miss. Avoid a stampede.
-    $name = 'variable_init';
-    $lock = \Drupal::lock();
-    if (!$lock->acquire($name, 1)) {
-      // Another request is building the variable cache.
-      // Wait, then re-run this function.
-      $lock->wait($name);
-      return variable_initialize($conf);
-    }
-    else {
-      // Proceed with variable rebuild.
-      $variables = array_map('unserialize', db_query('SELECT name, value FROM {variable}')->fetchAllKeyed());
-      cache('bootstrap')->set('variables', $variables);
-      $lock->release($name);
-    }
-  }
-
-  foreach ($conf as $name => $value) {
-    $variables[$name] = $value;
-  }
-
-  return $variables;
-}
-
-/**
- * Returns a persistent variable.
- *
- * Case-sensitivity of the variable_* functions depends on the database
- * collation used. To avoid problems, always use lower case for persistent
- * variable names.
- *
- * @param $name
- *   The name of the variable to return.
- * @param $default
- *   The default value to use if this variable has never been set.
- *
- * @return
- *   The value of the variable. Unserialization is taken care of as necessary.
- *
- * @deprecated This will be removed in Drupal 8.0. Instead, use the
- *   configuration API.
- *
- * @see \Drupal\Core\Config::get()
- */
-function variable_get($name, $default = NULL) {
-  global $conf;
-
-  return isset($conf[$name]) ? $conf[$name] : $default;
-}
-
-/**
- * Sets a persistent variable.
- *
- * Case-sensitivity of the variable_* functions depends on the database
- * collation used. To avoid problems, always use lower case for persistent
- * variable names.
- *
- * @param $name
- *   The name of the variable to set.
- * @param $value
- *   The value to set. This can be any PHP data type; these functions take care
- *   of serialization as necessary.
- *
- * @deprecated This will be removed in Drupal 8.0. Instead, use the
- *   configuration API.
- *
- * @see \Drupal\Core\Config::set()
- */
-function variable_set($name, $value) {
-  global $conf;
-
-  db_merge('variable')->key(array('name' => $name))->fields(array('value' => serialize($value)))->execute();
-
-  cache('bootstrap')->delete('variables');
-
-  $conf[$name] = $value;
-}
-
-/**
- * Unsets a persistent variable.
- *
- * Case-sensitivity of the variable_* functions depends on the database
- * collation used. To avoid problems, always use lower case for persistent
- * variable names.
- *
- * @param $name
- *   The name of the variable to undefine.
- *
- * @deprecated This will be removed in Drupal 8.0. Instead, use the
- *   configuration API.
- *
- * @see \Drupal\Core\Config::clear()
- */
-function variable_del($name) {
-  global $conf;
-
-  db_delete('variable')
-    ->condition('name', $name)
-    ->execute();
-  cache('bootstrap')->delete('variables');
-
-  unset($conf[$name]);
-}
-
-/**
  * Gets the page cache cid for this request.
  *
  * @param \Symfony\Component\HttpFoundation\Request $request