Variable $name is defined but not used in file_get_content_headers()

This is a follow-up issue for #1229014: Content-Disposition header makes private files show open/save prompts, but public files show inline.

file_get_content_headers() defines a variable named $name but it's not used.

It was used for the "Content-Disposition" header before the patch in #1229014: Content-Disposition header makes private files show open/save prompts, but public files show inline was committed. But it's not used currently.

function file_get_content_headers($file) {
  $name = mime_header_encode($file->filename);
  $type = mime_header_encode($file->filemime);

  return array(
    'Content-Type' => $type,
    'Content-Length' => $file->filesize,
    'Cache-Control' => 'private',
  );
}

The variable was already removed in D8.

function file_get_content_headers(FileInterface $file) {
  $type = Unicode::mimeHeaderEncode($file->getMimeType());

  return array(
    'Content-Type' => $type,
    'Content-Length' => $file->getSize(),
    'Cache-Control' => 'private',
  );
}

https://api.drupal.org/api/drupal/core%21modules%21file%21file.module/fu...

This variable isn't harmful but an existence of an unused variable is confusing for developers, I think.