Issue #2299499 by joshi.rohit100: Remove form_clear_error() as it is deprecated.

core/includes/form.inc

@@ -354,18 +354,6 @@ function form_set_error($name, array &$form_state, $message = '') {
   \Drupal::formBuilder()->setErrorByName($name, $form_state, $message);
 }
 
-/**
- * Clears all errors against all form elements made by form_set_error().
- *
- * @deprecated in Drupal 8.x-dev, will be removed before Drupal 8.0.
- *   Use \Drupal::formBuilder()->clearErrors().
- *
- * @see \Drupal\Core\Form\FormBuilderInterface::clearErrors().
- */
-function form_clear_error(array &$form_state) {
-  \Drupal::formBuilder()->clearErrors($form_state);
-}
-
 /**
  * Returns an associative array of all errors.
  *