minor #13206 [2.3] Cleanup deprecations (nicolas-grekas)

This PR was merged into the 2.3 branch.

Discussion
----------

[2.3] Cleanup deprecations

| Q             | A
| ------------- | ---
| Bug fix?      | no
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | let's see
| Fixed tickets | -
| License       | MIT
| Doc PR        | -

Commits
-------

d649bef [2.3] Remove useless tests skips
1d68ad3 [2.3] Cleanup deprecations

Tests/ClassMapGeneratorTest.php

@@ -120,10 +120,6 @@ class ClassMapGeneratorTest extends \PHPUnit_Framework_TestCase
 
     public function testCreateMapFinderSupport()
     {
-        if (!class_exists('Symfony\\Component\\Finder\\Finder')) {
-            $this->markTestSkipped('Finder component is not available');
-        }
-
         $finder = new \Symfony\Component\Finder\Finder();
         $finder->files()->in(__DIR__.'/Fixtures/beta/NamespaceCollision');