feature #9405 [FrameworkBundle] Added a helper method to create AccessDeniedException (klaussilveira)

This PR was squashed before being merged into the 2.5-dev branch (closes #9405).

Discussion
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[FrameworkBundle] Added a helper method to create AccessDeniedException

Just a small helper method that has been missing, since the addition of createNotFoundException().

| Q             | A
| ------------- | ---
| Bug fix?      | no
| New feature?  | yes
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets |
| License       | MIT
| Doc PR        |

Commits
-------

183d0ec [FrameworkBundle] Added a helper method to create AccessDeniedException

src/Symfony/Bundle/FrameworkBundle/Controller/Controller.php

@@ -18,6 +18,7 @@ use Symfony\Component\HttpFoundation\StreamedResponse;
 use Symfony\Component\DependencyInjection\ContainerAware;
 use Symfony\Component\HttpKernel\Exception\NotFoundHttpException;
 use Symfony\Component\HttpKernel\HttpKernelInterface;
+use Symfony\Component\Security\Core\Exception\AccessDeniedException;
 use Symfony\Component\Form\FormTypeInterface;
 use Symfony\Component\Form\Form;
 use Symfony\Component\Form\FormBuilder;
@@ -139,8 +140,8 @@ class Controller extends ContainerAware
      *
      *     throw $this->createNotFoundException('Page not found!');
      *
-     * @param string    $message  A message
-     * @param \Exception $previous The previous exception
+     * @param string          $message  A message
+     * @param \Exception|null $previous The previous exception
      *
      * @return NotFoundHttpException
      */
@@ -149,6 +150,23 @@ class Controller extends ContainerAware
         return new NotFoundHttpException($message, $previous);
     }
 
+    /**
+     * Returns an AccessDeniedException.
+     *
+     * This will result in a 403 response code. Usage example:
+     *
+     *     throw $this->createAccessDeniedException('Unable to access this page!');
+     *
+     * @param string          $message  A message
+     * @param \Exception|null $previous The previous exception
+     *
+     * @return AccessDeniedException
+     */
+    public function createAccessDeniedException($message = 'Access Denied', \Exception $previous = null)
+    {
+        return new AccessDeniedException($message, $previous);
+    }
+
     /**
      * Creates and returns a Form instance from the type of the form.
      *