Merge branch '3.3' into 3.4

* 3.3:
  use Precise on Travis to keep PHP LDAP support
  Fix case sensitive sameSite cookie
  [PropertyInfo] Use rawurlencode to escape PSR-6 keys
  fix(security): ensure the 'route' index is set before attempting to use it
  Fix the design of the profiler exceptions when there is no message
  [Config] Minor fix
  [WebProfilerBundle] Fix full sized dump hovering in toolbar

Author: nicolas-grekas

Resource/ClassExistenceResource.php

@@ -149,7 +149,7 @@ private static function throwOnRequiredClass($class)
             $props = array(
                 'file' => $trace[$i]['file'],
                 'line' => $trace[$i]['line'],
-                'trace' => array_slice($trace, 0, 1 + $i),
+                'trace' => array_slice($trace, 1 + $i),
             );
 
             foreach ($props as $p => $v) {