Removed deprecation notices from test files.

Author: Hugo Hamon

Tests/Core/LegacySecurityContextInterfaceTest.php

@@ -11,8 +11,6 @@
 
 namespace Symfony\Component\Security\Tests\Core;
 
-trigger_error('The '.__NAMESPACE__.'\SecurityContextInterfaceTest class is deprecated since version 2.6 and will be removed in 3.0.', E_USER_DEPRECATED);
-
 use Symfony\Component\Security\Core\SecurityContextInterface;
 use Symfony\Component\Security\Core\Security;