[DoctrineBundle] simplified getClassMetadataFactoryClass() method in both DisconnectedMetadataFactory and MetadataFactory classes.

src/Symfony/Bundle/DoctrineBundle/Mapping/DisconnectedMetadataFactory.php

@@ -20,6 +20,6 @@ class DisconnectedMetadataFactory extends MetadataFactory
 {
     protected function getClassMetadataFactoryClass()
     {
-        return '\\Doctrine\\ORM\Tools\\DisconnectedClassMetadataFactory';
+        return 'Doctrine\\ORM\Tools\\DisconnectedClassMetadataFactory';
     }
 }

src/Symfony/Bundle/DoctrineBundle/Mapping/MetadataFactory.php

@@ -172,6 +172,6 @@ class MetadataFactory
 
     protected function getClassMetadataFactoryClass()
     {
-        return '\\Doctrine\\ORM\\Mapping\\ClassMetadataFactory';
+        return 'Doctrine\\ORM\\Mapping\\ClassMetadataFactory';
     }
 }