[Form] Remove a redundant test.

This is exactly the same as testValidateTokenOnSubmitIfRootAndCompoundUsesTypeClassAsIntentionIfEmptyFormName().
Merge branch '2.3' into 2.5

* 2.3:
  [Form] Remove a redundant test.
  use value of DIRECTORY_SEPARATOR to detect Windows

Conflicts:
	src/Symfony/Component/Console/Application.php
	src/Symfony/Component/Filesystem/Tests/FilesystemTest.php
	src/Symfony/Component/Form/Tests/Extension/Csrf/Type/FormTypeCsrfExtensionTest.php
	src/Symfony/Component/Process/Process.php