[2.3] Cleanup deprecations

Author: nicolas-grekas

Tests/Controller/ExceptionControllerTest.php

@@ -19,7 +19,7 @@ class ExceptionControllerTest extends TestCase
 {
     public function testOnlyClearOwnOutputBuffers()
     {
-        $flatten = $this->getMock('Symfony\Component\HttpKernel\Exception\FlattenException');
+        $flatten = $this->getMock('Symfony\Component\Debug\Exception\FlattenException');
         $flatten
             ->expects($this->once())
             ->method('getStatusCode')

composer.json

@@ -18,7 +18,7 @@
     "require": {
         "php": ">=5.3.3",
         "symfony/twig-bridge": "~2.3,>=2.3.10",
-        "symfony/http-kernel": "~2.1"
+        "symfony/http-kernel": "~2.3,>=2.3.24"
     },
     "require-dev": {
         "symfony/stopwatch": "~2.2",