FLOW - delete image resource

ContentController.php

<?php
namespace ACME\Admin\Controller;


use TYPO3\Flow\Annotations as Flow;

/**
 * Class ContentController
 */
class ContentController extends \TYPO3\Flow\Mvc\Controller\ActionController
{
    /**
     * @Flow\Inject
     * @var \ACME\Admin\Domain\Repository\ContentRepository
     */
    protected $contentRepository;

    /**
     * @Flow\Inject
     * @var \TYPO3\Flow\Resource\ResourceManager
     */
    protected $resourceManager;

    /**
     * Mise à jour d'une actualité
     *
     * @param \ACME\Admin\Domain\Model\Content $content
     * @param bool $deleteImageFile
     * @return void
     */
    public function updateNewsAction(Content $content, $deleteImageFile = FALSE)
    {
	if ($deleteImageFile === TRUE) {
		$this->resourceManager->deleteResource($content->getImageFile()->getResource());
		$content->setImageFile(NULL);
	}

        $this->contentRepository->update($content);

        $this->redirect('indexNews');
    }

    /**
     * Suppression d'une actualité
     *
     * @param Content $content
     * @return void
     */
    public function deleteNewsAction(Content $content)
    {
	if ($content->getImageFile() !== NULL) {
		$this->resourceManager->deleteResource($content->getImageFile()->getResource());
	}
        $this->contentRepository->remove($content);
	$this->redirect('indexNews');
    }

}

Partial.html

<div class="row">
	<div class="col-md-12">
		<div class="portlet box blue">
			<div class="portlet-title">
				<div class="caption">
					Image de fond
				</div>
			</div>
			<div class="portlet-body">
				<f:if condition="{content.imageFile}">
					<div class="thumbnail">
						<m:image image="{content.imageFile}"
								 maximumWidth="400"
								 maximumHeight="200"
								 alt=""/>
						<div class="caption">
							<p>Taille réelle : {content.imageFile.width}x{content.imageFile.height}</p>
							<label><f:form.checkbox name="deleteImageFile" value="TRUE"/> Supprimer</label>
						</div>
					</div>
				</f:if>
				<div class="fileinput fileinput-new" data-provides="fileinput">
					<span class="btn default btn-file">
						<span class="fileinput-new">Sélectionnez un fichier </span>
						<span class="fileinput-exists">Changer </span>
						<f:form.upload property="imageFile.resource"/>
					</span>
					<span class="fileinput-filename"></span>
					&nbsp; <a href="#" class="close fileinput-exists" data-dismiss="fileinput"></a>
				</div>
			</div>
		</div>
	</div>
</div>