minor symfony#19802 [Yaml] Remove legacy code (Ener-Getick)

This PR was merged into the 2.7 branch.

Discussion
----------

[Yaml] Remove legacy code

| Q             | A
| ------------- | ---
| Branch?       | 2.7
| Bug fix?      | yes
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets |
| License       | MIT
| Doc PR        |

It looks like these lines were forgotten during the transition to 2.0 as references are already [managed in `Inline`](https://github.com/symfony/symfony/blob/master/src/Symfony/Component/Yaml/Inline.php#L542-L559).

Commits
-------

a88dff3 [Yaml] Remove legacy code

Author: fabpot

src/Symfony/Component/Yaml/Parser.php

@@ -259,17 +259,6 @@ public function parse($value, $exceptionOnInvalidType = false, $objectSupport =
                         throw $e;
                     }
 
-                    if (is_array($value)) {
-                        $first = reset($value);
-                        if (is_string($first) && 0 === strpos($first, '*')) {
-                            $data = array();
-                            foreach ($value as $alias) {
-                                $data[] = $this->refs[substr($alias, 1)];
-                            }
-                            $value = $data;
-                        }
-                    }
-
                     if (isset($mbEncoding)) {
                         mb_internal_encoding($mbEncoding);
                     }