minor #18584 [Serializer] Remove dead code (theofidry)

This PR was merged into the 2.7 branch.

Discussion
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[Serializer] Remove dead code

| Q             | A
| ------------- | ---
| Branch?       | 2.7+
| Bug fix?      | yes
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | none
| License       | MIT
| Doc PR        | none

The deleted lines are the exact equivalent of L249-251. It looks like this is due from a bad merged when the (de)normalization cache has been removed.

Commits
-------

31c530a Remove dead code

src/Symfony/Component/Serializer/Serializer.php

@@ -250,15 +250,6 @@ private function denormalizeObject($data, $class, $format, array $context = arra
             return $normalizer->denormalize($data, $class, $format, $context);
         }
 
-        foreach ($this->normalizers as $normalizer) {
-            if (
-                $normalizer instanceof DenormalizerInterface &&
-                $normalizer->supportsDenormalization($data, $class, $format)
-            ) {
-                return $normalizer->denormalize($data, $class, $format, $context);
-            }
-        }
-
         throw new UnexpectedValueException(sprintf('Could not denormalize object of type %s, no supporting normalizer found.', $class));
     }