minor #15711 removed some Form related deprecation notices (fabpot)

This PR was merged into the 2.8 branch.

Discussion
----------

removed some Form related deprecation notices

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

This removes a deprecation notice.

Commits
-------

4253824 removed some Form deprecation notices

src/Symfony/Bundle/FrameworkBundle/Controller/Controller.php

@@ -260,7 +260,7 @@ class Controller extends ContainerAware
      */
     public function createFormBuilder($data = null, array $options = array())
     {
-        return $this->container->get('form.factory')->createBuilder('form', $data, $options);
+        return $this->container->get('form.factory')->createBuilder('Symfony\Component\Form\Extension\Core\Type\FormType', $data, $options);
     }
 
     /**

src/Symfony/Component/Form/Extension/DataCollector/Type/DataCollectorTypeExtension.php

@@ -49,6 +49,6 @@ class DataCollectorTypeExtension extends AbstractTypeExtension
      */
     public function getExtendedType()
     {
-        return 'form';
+        return 'Symfony\Component\Form\Extension\Core\Type\FormType';
     }
 }

src/Symfony/Component/Form/Extension/HttpFoundation/Type/FormTypeHttpFoundationExtension.php

@@ -55,6 +55,6 @@ class FormTypeHttpFoundationExtension extends AbstractTypeExtension
      */
     public function getExtendedType()
     {
-        return 'form';
+        return 'Symfony\Component\Form\Extension\Core\Type\FormType';
     }
 }

src/Symfony/Component/Form/Tests/Extension/DataCollector/DataCollectorExtensionTest.php

@@ -36,7 +36,7 @@ class DataCollectorExtensionTest extends \PHPUnit_Framework_TestCase
 
     public function testLoadTypeExtensions()
     {
-        $typeExtensions = $this->extension->getTypeExtensions('form');
+        $typeExtensions = $this->extension->getTypeExtensions('Symfony\Component\Form\Extension\Core\Type\FormType');
 
         $this->assertInternalType('array', $typeExtensions);
         $this->assertCount(1, $typeExtensions);

src/Symfony/Component/Form/Tests/Extension/DataCollector/Type/DataCollectorTypeExtensionTest.php

@@ -33,7 +33,7 @@ class DataCollectorTypeExtensionTest extends \PHPUnit_Framework_TestCase
 
     public function testGetExtendedType()
     {
-        $this->assertEquals('form', $this->extension->getExtendedType());
+        $this->assertEquals('Symfony\Component\Form\Extension\Core\Type\FormType', $this->extension->getExtendedType());
     }
 
     public function testBuildForm()