Delete RenderSelectionInfo and other selection rect paint invalidation code.

sky/engine/core/rendering/RenderLayer.h

 /*
  * Copyright (C) 2003, 2009, 2012 Apple Inc. All rights reserved.
  * Copyright (C) 2013 Intel Corporation. All rights reserved.
  *
  * Portions are Copyright (C) 1998 Netscape Communications Corporation.
  *
  * Other contributors:
  *   Robert O'Callahan <roc+@cs.cmu.edu>
  *   David Baron <dbaron@fas.harvard.edu>
  *   Christian Biesinger <cbiesinger@web.de>
@@ skipping 108 matching lines @@
     bool isRootLayer() const { return m_isRootLayer; }
 
     void updateLayerPositionsAfterLayout();
 
     void updateTransformationMatrix();
     RenderLayer* renderingContextRoot();
 
     // Our current relative position offset.
     const LayoutSize offsetForInFlowPosition() const;
 
-    void addBlockSelectionGapsBounds(const LayoutRect&);
-    void clearBlockSelectionGapsBounds();
-    IntRect blockSelectionGapsBounds() const;
-
     RenderLayerStackingNode* stackingNode() { return m_stackingNode.get(); }
     const RenderLayerStackingNode* stackingNode() const { return m_stackingNode.get(); }
 
     bool hasBoxDecorationsOrBackground() const;
     bool hasVisibleBoxDecorations() const;
     // Returns true if this layer has visible content (ignoring any child layers).
     bool isVisuallyNonEmpty() const;
     // True if this layer container renderers that paint.
     bool hasNonEmptyChildRenderers() const;
 
@@ skipping 392 matching lines @@
 
     // Cached normal flow values for absolute positioned elements with static left/top values.
     LayoutUnit m_staticInlinePosition;
     LayoutUnit m_staticBlockPosition;
 
     OwnPtr<TransformationMatrix> m_transform;
 
     DescendantDependentCompositingInputs m_descendantDependentCompositingInputs;
     AncestorDependentCompositingInputs m_ancestorDependentCompositingInputs;
 
-    IntRect m_blockSelectionGapsBounds;

[ojan, 2015/01/13 00:40:47]

This member gets written, but is never read.

-
     OwnPtr<RenderLayerScrollableArea> m_scrollableArea;
 
     RenderLayerClipper m_clipper; // FIXME: Lazily allocate?
     OwnPtr<RenderLayerStackingNode> m_stackingNode;
 
     LayoutSize m_subpixelAccumulation; // The accumulated subpixel offset of a composited layer's composited bounds compared to absolute coordinates.
 };
 
 } // namespace blink
 
 #ifndef NDEBUG
 // Outside the WebCore namespace for ease of invocation from gdb.
 void showLayerTree(const blink::RenderLayer*);
 void showLayerTree(const blink::RenderObject*);
 #endif
 
 #endif  // SKY_ENGINE_CORE_RENDERING_RENDERLAYER_H_