RequestServer: Remove unused threading-related includes

Author: https://github.com/trflynn89
Commit: https://github.com/LadybirdBrowser/ladybird/commit/93ec010bee2
Pull-request: https://github.com/LadybirdBrowser/ladybird/pull/1488
Reviewed-by: https://github.com/alimpfard ✅

Userland/Services/RequestServer/ConnectionFromClient.h

@@ -7,10 +7,7 @@
 #pragma once
 
 #include <AK/HashMap.h>
-#include <LibCore/SharedCircularQueue.h>
 #include <LibIPC/ConnectionFromClient.h>
-#include <LibThreading/MutexProtected.h>
-#include <LibThreading/ThreadPool.h>
 #include <LibWebSocket/WebSocket.h>
 #include <RequestServer/Forward.h>
 #include <RequestServer/RequestClientEndpoint.h>