Revert "minor #20011 Use UUID for error codes for Form validator. (Koc)"

This reverts commit 2cd45a5, reversing
changes made to d842307.

Author: fabpot

src/Symfony/Component/Form/Extension/Validator/Constraints/Form.php

@@ -18,14 +18,14 @@
  */
 class Form extends Constraint
 {
-    const NOT_SYNCHRONIZED_ERROR = '1dafa156-89e1-4736-b832-419c2e501fca';
-    const NO_SUCH_FIELD_ERROR = '6e5212ed-a197-4339-99aa-5654798a4854';
+    const NOT_SYNCHRONIZED_ERROR = 1;
+    const NO_SUCH_FIELD_ERROR = 2;
 
     /**
      * @deprecated since version 2.6, to be removed in 3.0.
      *             Use {@self NOT_SYNCHRONIZED_ERROR} instead.
      */
-    const ERR_INVALID = self::NOT_SYNCHRONIZED_ERROR;
+    const ERR_INVALID = 1;
 
     protected static $errorNames = array(
         self::NOT_SYNCHRONIZED_ERROR => 'NOT_SYNCHRONIZED_ERROR',