Fix tests for legacy phpunit versions

Author: nicolas-grekas

src/Symfony/Component/Form/FormInterface.php

@@ -29,7 +29,7 @@ interface FormInterface extends \ArrayAccess, \Traversable, \Countable
      * @throws Exception\LogicException            when trying to set a parent for a form with
      *                                             an empty name
      */
-    public function setParent(self $parent = null);
+    public function setParent(FormInterface $parent = null);
 
     /**
      * Returns the parent form.

src/Symfony/Component/HttpKernel/Profiler/Profile.php

@@ -74,7 +74,7 @@ public function getToken()
     /**
      * Sets the parent token.
      */
-    public function setParent(self $parent)
+    public function setParent(Profile $parent)
     {
         $this->parent = $parent;
     }
@@ -213,7 +213,7 @@ public function setChildren(array $children)
     /**
      * Adds the child token.
      */
-    public function addChild(self $child)
+    public function addChild(Profile $child)
     {
         $this->children[] = $child;
         $child->setParent($this);