Delete a bunch of noop paint invalidation code.

sky/engine/web/ChromeClientImpl.h

 /*
  * Copyright (C) 2009 Google Inc. All rights reserved.
  * Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
@@ skipping 57 matching lines @@
     virtual void takeFocus(FocusType) override;
     virtual void focusedNodeChanged(Node*) override;
     virtual void focusedFrameChanged(LocalFrame*) override;
     virtual void show(NavigationPolicy) override;
     virtual bool shouldReportDetailedMessageForSource(const WTF::String&) override;
     virtual void addMessageToConsole(
         LocalFrame*, MessageSource, MessageLevel,
         const WTF::String& message, unsigned lineNumber,
         const WTF::String& sourceID, const WTF::String& stackTrace) override;
     virtual bool tabsToLinks() override;
-    virtual void invalidateContentsAndRootView(const IntRect&) override;
-    virtual void invalidateContentsForSlowScroll(const IntRect&) override;
     virtual void scheduleAnimation() override;
     virtual IntRect rootViewToScreen(const IntRect&) const override;
     virtual WebScreenInfo screenInfo() const override;
     virtual void layoutUpdated(LocalFrame*) const override;
     virtual void mouseDidMoveOverElement(
         const HitTestResult&, unsigned modifierFlags) override;
     virtual void setToolTip(const WTF::String& tooltipText, TextDirection) override;
     virtual void setCursor(const Cursor&) override;
     virtual void setTouchAction(TouchAction) override;
 
@@ skipping 18 matching lines @@
     void setCursor(const WebCursorInfo&);
 
     WebViewImpl* m_webView;  // weak pointer
 };
 
 DEFINE_TYPE_CASTS(ChromeClientImpl, ChromeClient, client, client->isChromeClientImpl(), client.isChromeClientImpl());
 
 } // namespace blink
 
 #endif  // SKY_ENGINE_WEB_CHROMECLIENTIMPL_H_