LibGUI: Remove some hand-rolled type information from Widget

Author: awesomekling

Libraries/LibGUI/AbstractButton.h

@@ -73,8 +73,6 @@ class AbstractButton : public Widget {
     void paint_text(Painter&, const Gfx::IntRect&, const Gfx::Font&, Gfx::TextAlignment);
 
 private:
-    virtual bool is_abstract_button() const final { return true; }
-
     String m_text;
     bool m_checked { false };
     bool m_checkable { false };

Libraries/LibGUI/RadioButton.h

@@ -47,8 +47,6 @@ class RadioButton : public AbstractButton {
     using AbstractButton::auto_repeat_interval;
     using AbstractButton::set_auto_repeat_interval;
 
-    virtual bool is_radio_button() const final { return true; }
-
     static Gfx::IntSize circle_size();
 };
 

Libraries/LibGUI/Widget.h

@@ -282,9 +282,6 @@ class Widget : public Core::Object {
 
     Vector<Widget*> child_widgets() const;
 
-    virtual bool is_radio_button() const { return false; }
-    virtual bool is_abstract_button() const { return false; }
-
     void do_layout();
 
     Gfx::Palette palette() const;