bug #18491 [DependencyInjection] anonymous services are always private (xabbuh)

This PR was merged into the 2.7 branch.

Discussion
----------

[DependencyInjection] anonymous services are always private

| 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        |

Commits
-------

0a469a4 anonymous services are always private

Author: nicolas-grekas

Loader/XmlFileLoader.php

@@ -302,11 +302,7 @@ private function processAnonymousServices(\DOMDocument $xml, $file)
                 // give it a unique name
                 $id = sprintf('%s_%d', hash('sha256', $file), ++$count);
                 $node->setAttribute('id', $id);
-
-                if ($services = $this->getChildren($node, 'service')) {
-                    $definitions[$id] = array($node, $file, true);
-                    $services[0]->setAttribute('id', $id);
-                }
+                $definitions[$id] = array($node, $file, true);
             }
         }