[DependencyInjection] fixed YamlDumper did not make services private.

src/Symfony/Component/DependencyInjection/Dumper/YamlDumper.php

@@ -74,6 +74,10 @@ class YamlDumper extends Dumper
             $code .= sprintf("        class: %s\n", $definition->getClass());
         }
 
+        if (!$definition->isPublic()) {
+            $code .= "        public: false\n";
+        }
+
         $tagsCode = '';
         foreach ($definition->getTags() as $name => $tags) {
             foreach ($tags as $attributes) {

src/Symfony/Component/DependencyInjection/Tests/Fixtures/yaml/services9.yml

@@ -48,6 +48,7 @@ services:
 
     inlined:
         class: Bar
+        public: false
         properties: { pub: pub }
         calls:
             - [setBaz, ['@baz']]