Remove assorted dead paint invalidation code.

sky/engine/core/rendering/RenderBox.h

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  * Copyright (C) 2003, 2006, 2007 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
  * 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 @@
     ScrollOffsetClamped
 };
 
 struct RenderBoxRareData {
     WTF_MAKE_NONCOPYABLE(RenderBoxRareData); WTF_MAKE_FAST_ALLOCATED;
 public:
     RenderBoxRareData()
         : m_inlineBoxWrapper(0)
         , m_overrideLogicalContentHeight(-1)
         , m_overrideLogicalContentWidth(-1)
-        , m_previousBorderBoxSize(-1, -1)
     {
     }
 
     // For inline replaced elements, the inline box that owns us.
     InlineBox* m_inlineBoxWrapper;
-
     LayoutUnit m_overrideLogicalContentHeight;
     LayoutUnit m_overrideLogicalContentWidth;
-
-    // Set by RenderBox::updatePreviousBorderBoxSizeIfNeeded().
-    LayoutSize m_previousBorderBoxSize;
 };
 
 
 class RenderBox : public RenderBoxModelObject {
 public:
     explicit RenderBox(ContainerNode*);
 
     // hasAutoZIndex only returns true if the element is positioned or a flex-item since
     // position:static elements that are not flex-items get their z-index coerced to auto.
     virtual LayerType layerTypeRequired() const override
@@ skipping 481 matching lines @@
     // These include tables, positioned objects, floats and flexible boxes.
     virtual void computePreferredLogicalWidths() { clearPreferredLogicalWidthsDirty(); }
 
     RenderBoxRareData& ensureRareData()
     {
         if (!m_rareData)
             m_rareData = adoptPtr(new RenderBoxRareData());
         return *m_rareData.get();
     }
 
-    void savePreviousBorderBoxSizeIfNeeded();
-    LayoutSize computePreviousBorderBoxSize(const LayoutSize& previousBoundsSize) const;
-
     bool logicalHeightComputesAsNone(SizeType) const;
 
     bool isBox() const = delete; // This will catch anyone doing an unnecessary check.
 
     // The width/height of the contents + borders + padding.  The x/y location is relative to our container (which is not always our parent).
     LayoutRect m_frameRect;
 
     // Our intrinsic height, used for min-height: min-content etc. Maintained by
     // updateLogicalHeight. This is logicalHeight() before it is clamped to
     // min/max.
@@ skipping 53 matching lines @@
         if (UNLIKELY(inlineBoxWrapper() != 0))
             deleteLineBoxWrapper();
     }
 
     ensureRareData().m_inlineBoxWrapper = boxWrapper;
 }
 
 } // namespace blink
 
 #endif  // SKY_ENGINE_CORE_RENDERING_RENDERBOX_H_