Delete RenderSelectionInfo and other selection rect paint invalidation code.

sky/engine/core/rendering/RenderBlock.h

Index: sky/engine/core/rendering/RenderBlock.h
diff --git a/sky/engine/core/rendering/RenderBlock.h b/sky/engine/core/rendering/RenderBlock.h
index 2506fd6aa3ff37bc84cd2ecd4503dad1449e6459..c65de9ba631bde1b735d26d9da708da2a24af73d 100644
--- a/sky/engine/core/rendering/RenderBlock.h
+++ b/sky/engine/core/rendering/RenderBlock.h
@@ -143,7 +143,6 @@ public:
     LayoutUnit inlineDirectionOffset(const LayoutSize& offsetFromBlock) const;
 
     virtual bool shouldPaintSelectionGaps() const override final;
-    GapRects selectionGapRectsForPaintInvalidation(const RenderLayerModelObject* paintInvalidationContainer);
     LayoutRect logicalLeftSelectionGap(RenderBlock* rootBlock, const LayoutPoint& rootBlockPhysicalPosition, const LayoutSize& offsetFromRootBlock,
                                        RenderObject* selObj, LayoutUnit logicalLeft, LayoutUnit logicalTop, LayoutUnit logicalHeight, const PaintInfo*);
     LayoutRect logicalRightSelectionGap(RenderBlock* rootBlock, const LayoutPoint& rootBlockPhysicalPosition, const LayoutSize& offsetFromRootBlock,
@@ -297,10 +296,7 @@ private:
     // children.
     virtual RenderBlock* firstLineBlock() const override;
 
-    virtual LayoutRect selectionRectForPaintInvalidation(const RenderLayerModelObject* paintInvalidationContainer, bool /*clipToVisibleContent*/) override final
-    {
-        return selectionGapRectsForPaintInvalidation(paintInvalidationContainer);
-    }
+    virtual LayoutRect selectionRectForPaintInvalidation(const RenderLayerModelObject* paintInvalidationContainer, bool /*clipToVisibleContent*/) final;
     bool isSelectionRoot() const;
     GapRects selectionGaps(RenderBlock* rootBlock, const LayoutPoint& rootBlockPhysicalPosition, const LayoutSize& offsetFromRootBlock,
                            LayoutUnit& lastLogicalTop, LayoutUnit& lastLogicalLeft, LayoutUnit& lastLogicalRight, const PaintInfo* = 0);