minor #15734 drop unused private methods (ewgRa)

This PR was submitted for the 2.8 branch but it was merged into the 2.3 branch instead (closes #15734).

Discussion
----------

drop unused private methods

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

Just drop two unused methods.

Commits
-------

0ffcc4f drop unused private methods

src/Symfony/Component/Form/Tests/Extension/Core/DataMapper/PropertyPathMapperTest.php

@@ -76,14 +76,6 @@ class PropertyPathMapperTest extends \PHPUnit_Framework_TestCase
         return $form;
     }
 
-    /**
-     * @return \PHPUnit_Framework_MockObject_MockObject
-     */
-    private function getDataMapper()
-    {
-        return $this->getMock('Symfony\Component\Form\DataMapperInterface');
-    }
-
     public function testMapDataToFormsPassesObjectRefIfByReference()
     {
         $car = new \stdClass();

src/Symfony/Component/Form/Tests/FormFactoryTest.php

@@ -489,11 +489,6 @@ class FormFactoryTest extends \PHPUnit_Framework_TestCase
         return $this->getMock('Symfony\Component\Form\ResolvedFormTypeInterface');
     }
 
-    private function getMockType()
-    {
-        return $this->getMock('Symfony\Component\Form\FormTypeInterface');
-    }
-
     private function getMockFormBuilder()
     {
         return $this->getMock('Symfony\Component\Form\Test\FormBuilderInterface');