LibWeb: Remove set_event_characteristics()

These methods were overriding properties specified by the EventInit
property bags in the constructor for WheelEvent and MouseEvent.

They appear to be legacy code and no longer relevant, as they would have
been used for ensuring natively dispatched events had the correct
properties --- This is now done in separate create methods, such as
MouseEvent::create_from_platform_event.

This fixes a couple WPT failures (e.g. in
/dom/events/Event-subclasses-constructors.html)

Userland/Libraries/LibWeb/DOM/Document.cpp

@@ -1354,6 +1354,9 @@ void Document::set_hovered_node(Node* node)
     // https://w3c.github.io/uievents/#mouseout
     if (old_hovered_node && old_hovered_node != m_hovered_node) {
         UIEvents::MouseEventInit mouse_event_init {};
+        mouse_event_init.bubbles = true;
+        mouse_event_init.cancelable = true;
+        mouse_event_init.composed = true;
         mouse_event_init.related_target = m_hovered_node;
         auto event = UIEvents::MouseEvent::create(realm(), UIEvents::EventNames::mouseout, mouse_event_init);
         old_hovered_node->dispatch_event(event);
@@ -1373,6 +1376,9 @@ void Document::set_hovered_node(Node* node)
     // https://w3c.github.io/uievents/#mouseover
     if (m_hovered_node && m_hovered_node != old_hovered_node) {
         UIEvents::MouseEventInit mouse_event_init {};
+        mouse_event_init.bubbles = true;
+        mouse_event_init.cancelable = true;
+        mouse_event_init.composed = true;
         mouse_event_init.related_target = old_hovered_node;
         auto event = UIEvents::MouseEvent::create(realm(), UIEvents::EventNames::mouseover, mouse_event_init);
         m_hovered_node->dispatch_event(event);

Userland/Libraries/LibWeb/UIEvents/MouseEvent.cpp

@@ -47,7 +47,6 @@ MouseEvent::MouseEvent(JS::Realm& realm, FlyString const& event_name, MouseEvent
     , m_buttons(event_init.buttons)
     , m_related_target(event_init.related_target)
 {
-    set_event_characteristics();
 }
 
 MouseEvent::~MouseEvent() = default;
@@ -148,13 +147,4 @@ WebIDL::ExceptionOr<JS::NonnullGCPtr<MouseEvent>> MouseEvent::create_from_platfo
     return event;
 }
 
-void MouseEvent::set_event_characteristics()
-{
-    if (type().is_one_of(EventNames::mousedown, EventNames::mousemove, EventNames::mouseout, EventNames::mouseover, EventNames::mouseup, HTML::EventNames::click, EventNames::dblclick, EventNames::contextmenu)) {
-        set_bubbles(true);
-        set_cancelable(true);
-        set_composed(true);
-    }
-}
-
 }

Userland/Libraries/LibWeb/UIEvents/MouseEvent.h

@@ -77,8 +77,6 @@ protected:
 private:
     virtual bool is_mouse_event() const override { return true; }
 
-    void set_event_characteristics();
-
     double m_screen_x { 0 };
     double m_screen_y { 0 };
     double m_page_x { 0 };

Userland/Libraries/LibWeb/UIEvents/WheelEvent.cpp

@@ -23,7 +23,6 @@ WheelEvent::WheelEvent(JS::Realm& realm, FlyString const& event_name, WheelEvent
     , m_delta_z(event_init.delta_z)
     , m_delta_mode(event_init.delta_mode)
 {
-    set_event_characteristics();
 }
 
 WheelEvent::~WheelEvent() = default;
@@ -65,11 +64,4 @@ WebIDL::ExceptionOr<JS::NonnullGCPtr<WheelEvent>> WheelEvent::create_from_platfo
     return event;
 }
 
-void WheelEvent::set_event_characteristics()
-{
-    set_bubbles(true);
-    set_cancelable(true);
-    set_composed(true);
-}
-
 }

Userland/Libraries/LibWeb/UIEvents/WheelEvent.h

@@ -48,8 +48,6 @@ private:
 
     virtual void initialize(JS::Realm&) override;
 
-    void set_event_characteristics();
-
     double m_delta_x { 0 };
     double m_delta_y { 0 };
     double m_delta_z { 0 };