LibWeb: Implement WindowEventHandlers

Author: https://github.com/Lubrsi
Commit: 3fe66bddf4
Pull-request: https://github.com/SerenityOS/serenity/pull/14406
Reviewed-by: https://github.com/linusg

Userland/Libraries/LibWeb/HTML/GlobalEventHandlers.cpp

@@ -4,11 +4,7 @@
  * SPDX-License-Identifier: BSD-2-Clause
  */
 
-#include <LibJS/Interpreter.h>
-#include <LibJS/Parser.h>
-#include <LibWeb/DOM/Document.h>
-#include <LibWeb/DOM/IDLEventListener.h>
-#include <LibWeb/HTML/EventHandler.h>
+#include <LibWeb/DOM/EventTarget.h>
 #include <LibWeb/HTML/EventNames.h>
 #include <LibWeb/HTML/GlobalEventHandlers.h>
 #include <LibWeb/UIEvents/EventNames.h>