Delete a bunch of noop paint invalidation code.

sky/engine/core/page/Chrome.h

 /*
  * Copyright (C) 2006, 2007, 2008, 2009 Apple Inc. All rights reserved.
  * Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).
  * Copyright (C) 2012, Samsung Electronics. 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
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
  *
@@ skipping 35 matching lines @@
 
 class Chrome final : public HostWindow {
 public:
     virtual ~Chrome();
 
     static PassOwnPtr<Chrome> create(Page*, ChromeClient*);
 
     ChromeClient& client() { return *m_client; }
 
     // HostWindow methods.
-    virtual void invalidateContentsAndRootView(const IntRect&) override;
-    virtual void invalidateContentsForSlowScroll(const IntRect&) override;
     virtual IntRect rootViewToScreen(const IntRect&) const override;
     virtual blink::WebScreenInfo screenInfo() const override;
 
     virtual void scheduleAnimation() override;
 
     void setCursor(const Cursor&);
 
     void setWindowRect(const FloatRect&) const;
     FloatRect windowRect() const;
 
@@ skipping 17 matching lines @@
 private:
     Chrome(Page*, ChromeClient*);
 
     Page* m_page;
     ChromeClient* m_client;
 };
 
 }
 
 #endif  // SKY_ENGINE_CORE_PAGE_CHROME_H_