LibCore: Remove unused methods from EventLoop

Author: https://github.com/LucasChollet
Commit: e015a43b51
Pull-request: https://github.com/LadybirdBrowser/ladybird/pull/3145
Reviewed-by: https://github.com/ADKaster ✅

Libraries/LibCore/EventLoop.h

@@ -72,8 +72,6 @@ public:
     void wake();
 
     void quit(int);
-    void unquit();
-    bool was_exit_requested() const;
 
     // The registration functions act upon the current loop of the current thread.
     static intptr_t register_timer(EventReceiver&, int milliseconds, bool should_reload, TimerShouldFireWhenNotVisible);
@@ -85,13 +83,6 @@ public:
     static int register_signal(int signo, ESCAPING Function<void(int)> handler);
     static void unregister_signal(int handler_id);
 
-    // Note: Boost uses Parent/Child/Prepare, but we don't really have anything
-    //       interesting to do in the parent or before forking.
-    enum class ForkEvent {
-        Child,
-    };
-    static void notify_forked(ForkEvent);
-
     static bool is_running();
     static EventLoop& current();