Removed ESI instance check

src/Symfony/Component/HttpKernel/HttpCache/HttpCache.php

@@ -153,16 +153,10 @@ class HttpCache implements HttpKernelInterface, TerminableInterface
     /**
      * Gets the Surrogate instance.
      *
-     * @throws \LogicException
-     *
      * @return SurrogateInterface A Surrogate instance
      */
     public function getSurrogate()
     {
-        if (!$this->surrogate instanceof Esi) {
-            throw new \LogicException('This instance of HttpCache was not set up to use ESI as surrogate handler. You must overwrite and use createSurrogate');
-        }
-
         return $this->surrogate;
     }