LibWeb: Provide a default DOM::EventTarget::dispatch_event()

All EventTarget subclasses except Window do the same exact thing in
their overrides, so let's just share an implementation in the base.

Userland/Libraries/LibWeb/DOM/AbortSignal.cpp

@@ -20,11 +20,6 @@ AbortSignal::~AbortSignal()
 {
 }
 
-bool AbortSignal::dispatch_event(NonnullRefPtr<Event> event)
-{
-    return EventDispatcher::dispatch(*this, event);
-}
-
 JS::Object* AbortSignal::create_wrapper(JS::GlobalObject& global_object)
 {
     return wrap(global_object, *this);

Userland/Libraries/LibWeb/DOM/AbortSignal.h

@@ -49,7 +49,6 @@ public:
     // ^EventTarget
     virtual void ref_event_target() override { ref(); }
     virtual void unref_event_target() override { unref(); }
-    virtual bool dispatch_event(NonnullRefPtr<Event>) override;
     virtual JS::Object* create_wrapper(JS::GlobalObject&) override;
 
 private:

Userland/Libraries/LibWeb/DOM/EventTarget.cpp

@@ -11,6 +11,7 @@
 #include <LibWeb/Bindings/ScriptExecutionContext.h>
 #include <LibWeb/DOM/Document.h>
 #include <LibWeb/DOM/Event.h>
+#include <LibWeb/DOM/EventDispatcher.h>
 #include <LibWeb/DOM/EventListener.h>
 #include <LibWeb/DOM/EventTarget.h>
 #include <LibWeb/DOM/Window.h>
@@ -147,4 +148,10 @@ void EventTarget::set_event_handler_attribute(FlyString const& name, HTML::Event
         target->add_event_listener(name, listener.release_nonnull());
     }
 }
+
+bool EventTarget::dispatch_event(NonnullRefPtr<Event> event)
+{
+    return EventDispatcher::dispatch(*this, move(event));
+}
+
 }

Userland/Libraries/LibWeb/DOM/EventTarget.h

@@ -31,7 +31,7 @@ public:
 
     void remove_from_event_listener_list(NonnullRefPtr<EventListener>);
 
-    virtual bool dispatch_event(NonnullRefPtr<Event>) = 0;
+    virtual bool dispatch_event(NonnullRefPtr<Event>);
     ExceptionOr<bool> dispatch_event_binding(NonnullRefPtr<Event>);
 
     virtual JS::Object* create_wrapper(JS::GlobalObject&) = 0;

Userland/Libraries/LibWeb/DOM/Node.cpp

@@ -163,11 +163,6 @@ bool Node::is_link() const
     return enclosing_link_element();
 }
 
-bool Node::dispatch_event(NonnullRefPtr<Event> event)
-{
-    return EventDispatcher::dispatch(*this, event);
-}
-
 String Node::child_text_content() const
 {
     if (!is<ParentNode>(*this))

Userland/Libraries/LibWeb/DOM/Node.h

@@ -51,7 +51,6 @@ public:
     // ^EventTarget
     virtual void ref_event_target() final { ref(); }
     virtual void unref_event_target() final { unref(); }
-    virtual bool dispatch_event(NonnullRefPtr<Event>) final;
     virtual JS::Object* create_wrapper(JS::GlobalObject&) override;
 
     virtual ~Node();