[FrameworkBundle][Serializer] Remove outdated condition

Author: ogizanagi

src/Symfony/Bundle/FrameworkBundle/Tests/Functional/SerializerTest.php

@@ -11,19 +11,13 @@
 
 namespace Symfony\Bundle\FrameworkBundle\Tests\Functional;
 
-use Symfony\Component\Serializer\Normalizer\DataUriNormalizer;
-
 /**
  * @author Kévin Dunglas <[email protected]>
  */
 class SerializerTest extends WebTestCase
 {
     public function testDeserializeArrayOfObject()
     {
-        if (!class_exists(DataUriNormalizer::class)) {
-            $this->markTestSkipped('This test is only applicable when using the Symfony Serializer Component version 3.1 or superior.');
-        }
-
         static::bootKernel(array('test_case' => 'Serializer'));
         $container = static::$kernel->getContainer();