move cookie payload check into cookie class.

laravel/session/drivers/cookie.php

@@ -41,14 +41,6 @@ class Cookie implements Driver {
 
 		$payload = Crypter::encrypt(serialize($session));
 
-		// A cookie payload can't exceed 4096 bytes, so if the encrypted payload
-		// is greater than that, we'll throw an exception so the developer can
-		// switch to another session driver for the application.
-		if (strlen($payload) > 4000)
-		{
-			throw new \Exception("Session payload too large for cookie.");
-		}
-
 		\Laravel\Cookie::put(Cookie::payload, $payload, $lifetime, $path, $domain);
 	}