UI/Qt: Remove unused WebContentView::dump_layout_tree

Ladybird/Qt/WebContentView.cpp

@@ -798,11 +798,6 @@ bool WebContentView::event(QEvent* event)
     return QAbstractScrollArea::event(event);
 }
 
-ErrorOr<String> WebContentView::dump_layout_tree()
-{
-    return String::from_byte_string(client().dump_layout_tree(m_client_state.page_index));
-}
-
 void WebContentView::enqueue_native_event(Web::MouseEvent::Type type, QSinglePointEvent const& event)
 {
     Web::DevicePixelPoint position = { event.position().x() * m_device_pixel_ratio, event.position().y() * m_device_pixel_ratio };

Ladybird/Qt/WebContentView.h

@@ -72,8 +72,6 @@ public:
     virtual void focusOutEvent(QFocusEvent*) override;
     virtual bool event(QEvent*) override;
 
-    ErrorOr<String> dump_layout_tree();
-
     void set_viewport_rect(Gfx::IntRect);
     void set_window_size(Gfx::IntSize);
     void set_window_position(Gfx::IntPoint);