Form extension deprecations

by @fabpot

Some issues have been detected in this pull request

Issues that can be fixed by applying a patch

Review the proposed patch then download it to apply it manually or execute the following command from the repository root directory:

curl https://fabbot.io/patch/symfony/symfony/20091/424524d039653d692c3bccbfbaf6224babbfd633/cs.diff | patch -p0
diff -ru src/Symfony/Bundle/TwigBundle/DependencyInjection/Compiler/RuntimeLoaderPass.php src/Symfony/Bundle/TwigBundle/DependencyInjection/Compiler/RuntimeLoaderPass.php
--- src/Symfony/Bundle/TwigBundle/DependencyInjection/Compiler/RuntimeLoaderPass.php	2016-09-29 18:35:29.855717125 +0000
+++ src/Symfony/Bundle/TwigBundle/DependencyInjection/Compiler/RuntimeLoaderPass.php	2016-09-29 18:35:36.039666694 +0000
@@ -11,10 +11,8 @@
 
 namespace Symfony\Bundle\TwigBundle\DependencyInjection\Compiler;
 
-use Symfony\Component\DependencyInjection\Reference;
 use Symfony\Component\DependencyInjection\ContainerBuilder;
 use Symfony\Component\DependencyInjection\Compiler\CompilerPassInterface;
-use Symfony\Component\DependencyInjection\Exception\RuntimeException;
 
 /**
  * Registers Twig runtime services.

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