minor symfony#22319 [HttpKernel] Fix missing use statement in RegisterControllerArgumentLocatorPass (chalasr)

This PR was merged into the 3.3-dev branch.

Discussion
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[HttpKernel] Fix missing use statement in RegisterControllerArgumentLocatorPass

| Q             | A
| ------------- | ---
| Branch?       | master
| Bug fix?      | yes (master only)
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | n/a
| License       | MIT
| Doc PR        | n/a

Maybe meaning that this one misses a test case ensuring parent definitions are indeed took into account

Commits
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dc2fe60 [HttpKernel] Fix missing use statement in RegisterControllerArgumentLocatorsPass

Author: nicolas-grekas

src/Symfony/Component/HttpKernel/DependencyInjection/RegisterControllerArgumentLocatorsPass.php

@@ -11,6 +11,7 @@
 
 namespace Symfony\Component\HttpKernel\DependencyInjection;
 
+use Symfony\Component\DependencyInjection\ChildDefinition;
 use Symfony\Component\DependencyInjection\Compiler\CompilerPassInterface;
 use Symfony\Component\DependencyInjection\Compiler\ServiceLocatorTagPass;
 use Symfony\Component\DependencyInjection\ContainerBuilder;