[2.6] cleanup deprecated uses

Author: nicolas-grekas

Extension/Core/Type/DateTimeType.php

@@ -242,7 +242,7 @@ public function setDefaultOptions(OptionsResolverInterface $resolver)
 
         // Don't add some defaults in order to preserve the defaults
         // set in DateType and TimeType
-        $resolver->setOptional(array(
+        $resolver->setDefined(array(
             'empty_value', // deprecated
             'placeholder',
             'years',

Extension/Core/Type/FormType.php

@@ -165,7 +165,7 @@ public function setDefaultOptions(OptionsResolverInterface $resolver)
 
         // If data is given, the form is locked to that data
         // (independent of its value)
-        $resolver->setOptional(array(
+        $resolver->setDefined(array(
             'data',
         ));
 

composer.json

@@ -19,7 +19,7 @@
         "php": ">=5.3.3",
         "symfony/event-dispatcher": "~2.1",
         "symfony/intl": "~2.3",
-        "symfony/options-resolver": "~2.1",
+        "symfony/options-resolver": "~2.6",
         "symfony/property-access": "~2.3"
     },
     "require-dev": {