Merge branch '3.3' into 3.4

* 3.3:
  [DI] Fix dumping with custom base class
  [HttpFoundation] Add test
  [HttpFoundation] Fix session-related BC break
  [Process] Workaround PHP bug #75515 in ProcessTest::testSimpleInputStream()
  fix method name

Author: nicolas-grekas

Dumper/PhpDumper.php

@@ -126,7 +126,12 @@ public function dump(array $options = array())
         $this->asFiles = $options['as_files'];
         $this->hotPathTag = $options['hot_path_tag'];
         $this->inlineRequires = $this->container->hasParameter($options['inline_class_loader_parameter']) && $this->container->getParameter($options['inline_class_loader_parameter']);
-        $this->initializeMethodNamesMap($options['base_class']);
+
+        if (0 !== strpos($baseClass = $options['base_class'], '\\') && 'Container' !== $baseClass) {
+            $baseClass = sprintf('%s\%s', $options['namespace'] ? '\\'.$options['namespace'] : '', $baseClass);
+        }
+
+        $this->initializeMethodNamesMap('Container' === $baseClass ? Container::class : $baseClass);
 
         $this->docStar = $options['debug'] ? '*' : '';
 
@@ -156,7 +161,7 @@ public function dump(array $options = array())
         }
 
         $code =
-            $this->startClass($options['class'], $options['base_class']).
+            $this->startClass($options['class'], $baseClass).
             $this->addServices().
             $this->addDefaultParametersMethod().
             $this->endClass()

Tests/Fixtures/php/services1-1.php

@@ -16,7 +16,7 @@
  *
  * @final since Symfony 3.3
  */
-class Container extends AbstractContainer
+class Container extends \Symfony\Component\DependencyInjection\Dump\AbstractContainer
 {
     private $parameters;
     private $targetDirs = array();