Remove unused var iriConverter (#4854)

Author: dannyvw

tests/Symfony/Routing/IriConverterTest.php

@@ -16,7 +16,6 @@
 use ApiPlatform\Api\IdentifiersExtractorInterface;
 use ApiPlatform\Api\ResourceClassResolverInterface;
 use ApiPlatform\Api\UrlGeneratorInterface;
-use ApiPlatform\Core\Api\IriConverterInterface;
 use ApiPlatform\Core\Tests\ProphecyTrait;
 use ApiPlatform\Exception\InvalidArgumentException;
 use ApiPlatform\Exception\RuntimeException;
@@ -284,8 +283,6 @@ private function getIriConverter($stateProviderProphecy = null, $routerProphecy
             $resourceMetadataCollectionFactoryProphecy = $this->prophesize(ResourceMetadataCollectionFactoryInterface::class);
         }
 
-        $iriConverter = $this->prophesize(IriConverterInterface::class);
-
         return new IriConverter($stateProviderProphecy->reveal(), $routerProphecy->reveal(), $identifiersExtractorProphecy->reveal(), $this->getResourceClassResolver(), $resourceMetadataCollectionFactoryProphecy->reveal(), $uriVariablesConverter);
     }
 }