Delete a bunch of noop paint invalidation code.

sky/engine/core/frame/FrameView.h

 /*
    Copyright (C) 1997 Martin Jones (mjones@kde.org)
              (C) 1998 Waldo Bastian (bastian@kde.org)
              (C) 1998, 1999 Torben Weis (weis@kde.org)
              (C) 1999 Lars Knoll (knoll@kde.org)
              (C) 1999 Antti Koivisto (koivisto@kde.org)
    Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009 Apple Inc. All rights reserved.
 
    This library is free software; you can redistribute it and/or
    modify it under the terms of the GNU Library General Public
@@ skipping 46 matching lines @@
 class FrameView final : public Widget {
 public:
     friend class RenderView;
 
     static PassRefPtr<FrameView> create(LocalFrame*);
     static PassRefPtr<FrameView> create(LocalFrame*, const IntSize& initialSize);
 
     virtual ~FrameView();
 
     virtual HostWindow* hostWindow() const override;
-    virtual void invalidateRect(const IntRect&) override;
     virtual void setFrameRect(const IntRect&) override;
 
     LocalFrame& frame() const { return *m_frame; }
     Page* page() const;
 
     RenderView* renderView() const;
 
     IntPoint clampOffsetAtScale(const IntPoint& offset, float scale) const;
 
     void layout(bool allowSubtree = true);
@@ skipping 189 matching lines @@
     bool m_layoutSizeFixedToFrameSize;
 
     Vector<IntRect> m_tickmarks;
 };
 
 DEFINE_TYPE_CASTS(FrameView, Widget, widget, widget->isFrameView(), widget.isFrameView());
 
 } // namespace blink
 
 #endif  // SKY_ENGINE_CORE_FRAME_FRAMEVIEW_H_