Issue #2209583 by ianthomas_uk: Remove use of drupal_set_title()/drupal_get_title()/_system_path from page cache.

core/includes/bootstrap.inc

@@ -1769,9 +1769,6 @@ function _drupal_bootstrap_page_cache() {
     if (is_object($cache)) {
       $response = new Response();
       $response->headers->set('X-Drupal-Cache', 'HIT');
-      // Restore the metadata cached with the page.
-      _current_path($cache->data['path']);
-      drupal_set_title($cache->data['title'], PASS_THROUGH);
       date_default_timezone_set(drupal_get_user_timezone());
 
       drupal_serve_page_from_cache($cache, $response, $request);

core/includes/common.inc

@@ -3248,9 +3248,7 @@ function drupal_page_set_cache(Response $response, Request $request) {
     $cache = (object) array(
       'cid' => drupal_page_cache_get_cid($request),
       'data' => array(
-        'path' => $request->attributes->get('_system_path'),
         'body' => $response->getContent(),
-        'title' => drupal_get_title(),
         'headers' => array(),
         // We need to store whether page was compressed or not,
         // because by the time it is read, the configuration might change.