LibWeb/HTML: Port Window.history to IDL

Author: https://github.com/linusg
Commit: c42496187b
Pull-request: https://github.com/SerenityOS/serenity/pull/17752
Reviewed-by: https://github.com/awesomekling

Userland/Libraries/LibWeb/Forward.h

@@ -249,6 +249,7 @@ class ErrorEvent;
 class EventHandler;
 class EventLoop;
 class FormDataEvent;
+class History;
 class HTMLAnchorElement;
 class HTMLAreaElement;
 class HTMLAudioElement;