Merge branch '3.4' into 4.4

* 3.4:
  Fixed typo in test name
  [HttpFondation] Change file extension of "audio/mpeg" from "mpga" to "mp3"
  [VarDumper] Support for cURL handler objects.
  [DI][FrameworkBundle] Remove whitelist occurrences
  Avoid accessibility errors on debug toolbar

Author: fabpot

File/MimeType/MimeTypeExtensionGuesser.php

@@ -625,7 +625,7 @@ class MimeTypeExtensionGuesser implements ExtensionGuesserInterface
         'audio/basic' => 'au',
         'audio/midi' => 'mid',
         'audio/mp4' => 'm4a',
-        'audio/mpeg' => 'mpga',
+        'audio/mpeg' => 'mp3',
         'audio/ogg' => 'oga',
         'audio/s3m' => 's3m',
         'audio/silk' => 'sil',