minor #21808 Fix DI test (chalasr)

This PR was merged into the 3.3-dev branch.

Discussion
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Fix DI test

| Q             | A
| ------------- | ---
| Branch?       | master
| Tests pass?   | yes

Should fix appveyor/travis builds

Commits
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8740e44086 Fix DI test

src/Symfony/Component/DependencyInjection/Tests/Fixtures/php/services_private_frozen.php

@@ -28,6 +28,11 @@ class ProjectServiceContainer extends Container
     public function __construct()
     {
         $this->services = array();
+        $this->normalizedIds = array(
+            'psr\\container\\containerinterface' => 'Psr\\Container\\ContainerInterface',
+            'symfony\\component\\dependencyinjection\\container' => 'Symfony\\Component\\DependencyInjection\\Container',
+            'symfony\\component\\dependencyinjection\\containerinterface' => 'Symfony\\Component\\DependencyInjection\\ContainerInterface',
+        );
         $this->methodMap = array(
             'bar_service' => 'getBarServiceService',
             'baz_service' => 'getBazServiceService',