LibCore: Remove unused CustomEvent

Author: https://github.com/awesomekling
Commit: aec1f6aa7e
Pull-request: https://github.com/LadybirdBrowser/ladybird/pull/5817
Reviewed-by: https://github.com/gmta ✅

Libraries/LibCore/Event.h

@@ -24,7 +24,6 @@ public:
         Timer,
         NotifierActivation,
         DeferredInvoke,
-        Custom,
     };
 
     Event() = default;
@@ -100,19 +99,4 @@ private:
     NotificationType m_type;
 };
 
-class CustomEvent : public Event {
-public:
-    CustomEvent(int custom_type)
-        : Event(Event::Type::Custom)
-        , m_custom_type(custom_type)
-    {
-    }
-    ~CustomEvent() = default;
-
-    int custom_type() const { return m_custom_type; }
-
-private:
-    int m_custom_type { 0 };
-};
-
 }

Libraries/LibCore/EventReceiver.cpp

@@ -31,8 +31,6 @@ void EventReceiver::event(Core::Event& event)
     case Core::Event::Invalid:
         VERIFY_NOT_REACHED();
         break;
-    case Core::Event::Custom:
-        return custom_event(static_cast<CustomEvent&>(event));
     default:
         break;
     }
@@ -42,10 +40,6 @@ void EventReceiver::timer_event(Core::TimerEvent&)
 {
 }
 
-void EventReceiver::custom_event(CustomEvent&)
-{
-}
-
 void EventReceiver::start_timer(int ms)
 {
     if (m_timer_id) {

Libraries/LibCore/EventReceiver.h

@@ -73,7 +73,6 @@ protected:
     virtual void event(Core::Event&);
 
     virtual void timer_event(TimerEvent&);
-    virtual void custom_event(CustomEvent&);
 
 private:
     intptr_t m_timer_id { 0 };