Merge branch '4.0'

* 4.0: (30 commits)
  [FrameworkBundle] fix tests
  [Serializer] Fixed throwing exception with option JSON_PARTIAL_OUTPUT_ON_ERROR
  [HttpKernel] Fix session handling: decouple "save" from setting response "private"
  swap filter/function and package names
  [HttpFoundation] Always call proxied handler::destroy() in StrictSessionHandler
  [HttpKernel] Fix compile error when a legacy container is fresh again
  Add tests for the HttpKernel request collector and redirection via cookies
  Uses cookies to track the requests redirection
  Tweaked some styles in the profiler tables
  Add type string to docblock for Process::setInput()
  [Security] Fail gracefully if the security token cannot be unserialized from the session
  [Form] AbstractLayoutTest - fix DOMDocument casing
  Run simple-phpunit with --no-suggest option
  [FrameworkBundle] Fix using "annotations.cached_reader" in after-removing passes
  bumped Symfony version to 4.0.4
  updated VERSION for 4.0.3
  updated CHANGELOG for 4.0.3
  bumped Symfony version to 3.4.4
  updated VERSION for 3.4.3
  updated CHANGELOG for 3.4.3
  ...

Author: xabbuh

Tests/AbstractLayoutTest.php

@@ -58,7 +58,7 @@ protected function assertXpathNodeValue(\DOMElement $element, $expression, $node
 
     protected function assertMatchesXpath($html, $expression, $count = 1)
     {
-        $dom = new \DomDocument('UTF-8');
+        $dom = new \DOMDocument('UTF-8');
         try {
             // Wrap in <root> node so we can load HTML with multiple tags at
             // the top level