[3.0] [Tests] minor fix following symfony#17787

Author: HeahDude

src/Symfony/Component/Form/Tests/AbstractBootstrap3LayoutTest.php

@@ -235,7 +235,6 @@ public function testSelectWithSizeBiggerThanOneCanBeRequired()
     {
         $form = $this->factory->createNamed('name', 'Symfony\Component\Form\Extension\Core\Type\ChoiceType', null, array(
             'choices' => array('a', 'b'),
-            'choices_as_values' => true,
             'multiple' => false,
             'expanded' => false,
             'attr' => array('size' => 2),

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

@@ -521,7 +521,6 @@ public function testSelectWithSizeBiggerThanOneCanBeRequired()
     {
         $form = $this->factory->createNamed('name', 'Symfony\Component\Form\Extension\Core\Type\ChoiceType', null, array(
             'choices' => array('a', 'b'),
-            'choices_as_values' => true,
             'multiple' => false,
             'expanded' => false,
             'attr' => array('size' => 2),

src/Symfony/Component/Form/Tests/Extension/Core/Type/ChoiceTypeTest.php

@@ -1306,7 +1306,6 @@ public function testDontPassPlaceholderIfContainedInChoices($multiple, $expanded
             'required' => $required,
             'placeholder' => $placeholder,
             'choices' => array('Empty' => '', 'A' => 'a'),
-            'choices_as_values' => true,
         ));
         $view = $form->createView();
 
@@ -1496,7 +1495,6 @@ public function testCustomChoiceTypeDoesNotInheritChoiceLabels()
                     '1' => '1',
                     '2' => '2',
                 ),
-                'choices_as_values' => true,
             )
         );
         $builder->add('subChoice', 'Symfony\Component\Form\Tests\Fixtures\ChoiceSubType');