minor symfony#17633 [FrameworkBundle] Remove unused code in test (dunglas)

This PR was merged into the 2.7 branch.

Discussion
----------

[FrameworkBundle] Remove unused code in test

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

Commits
-------

8780e26 [FrameworkBundle] Remove unused code in test

Author: fabpot

src/Symfony/Bundle/FrameworkBundle/Tests/DependencyInjection/PhpFrameworkExtensionTest.php

@@ -28,7 +28,7 @@ protected function loadFromFile(ContainerBuilder $container, $file)
      */
     public function testAssetsCannotHavePathAndUrl()
     {
-        $container = $this->createContainerFromClosure(function ($container) {
+        $this->createContainerFromClosure(function ($container) {
             $container->loadFromExtension('framework', array(
                 'assets' => array(
                     'base_urls' => 'http://cdn.example.com',
@@ -43,7 +43,7 @@ public function testAssetsCannotHavePathAndUrl()
      */
     public function testAssetPackageCannotHavePathAndUrl()
     {
-        $container = $this->createContainerFromClosure(function ($container) {
+        $this->createContainerFromClosure(function ($container) {
             $container->loadFromExtension('framework', array(
                 'assets' => array(
                     'packages' => array(