Constify the rendering/ selection code

Source/core/rendering/RenderBlockFlow.h

Index: Source/core/rendering/RenderBlockFlow.h
diff --git a/Source/core/rendering/RenderBlockFlow.h b/Source/core/rendering/RenderBlockFlow.h
index efb717e4eb8557ccaa97191122df8b487f3e2324..3344ef0d9f8d382ca8797f05b658649e20d2b1fb 100644
--- a/Source/core/rendering/RenderBlockFlow.h
+++ b/Source/core/rendering/RenderBlockFlow.h
@@ -95,8 +95,8 @@ public:
     using RenderBlock::firstRootBox;
     using RenderBlock::lastRootBox;
 
-    virtual LayoutUnit logicalLeftSelectionOffset(RenderBlock* rootBlock, LayoutUnit position) OVERRIDE;
-    virtual LayoutUnit logicalRightSelectionOffset(RenderBlock* rootBlock, LayoutUnit position) OVERRIDE;
+    virtual LayoutUnit logicalLeftSelectionOffset(const RenderBlock* rootBlock, LayoutUnit position) const OVERRIDE;
+    virtual LayoutUnit logicalRightSelectionOffset(const RenderBlock* rootBlock, LayoutUnit position) const OVERRIDE;
 
     RootInlineBox* createAndAppendRootInlineBox();
 
@@ -178,8 +178,8 @@ public:
     // FIXME: This should be const to avoid a const_cast, but can modify child dirty bits and RenderCombineText
     void computeInlinePreferredLogicalWidths(LayoutUnit& minLogicalWidth, LayoutUnit& maxLogicalWidth);
 
-    GapRects inlineSelectionGaps(RenderBlock* rootBlock, const LayoutPoint& rootBlockPhysicalPosition, const LayoutSize& offsetFromRootBlock,
-        LayoutUnit& lastLogicalTop, LayoutUnit& lastLogicalLeft, LayoutUnit& lastLogicalRight, const PaintInfo*);
+    GapRects inlineSelectionGaps(const RenderBlock* rootBlock, const LayoutPoint& rootBlockPhysicalPosition, const LayoutSize& offsetFromRootBlock,
+        LayoutUnit& lastLogicalTop, LayoutUnit& lastLogicalLeft, LayoutUnit& lastLogicalRight, const PaintInfo*) const;
 
     LayoutUnit paginationStrut() const { return m_rareData ? m_rareData->m_paginationStrut : LayoutUnit(); }
     void setPaginationStrut(LayoutUnit);
@@ -264,7 +264,7 @@ private:
     virtual void invalidatePaintForOverhangingFloats(bool paintAllDescendants) OVERRIDE FINAL;
     virtual void invalidatePaintForOverflow() OVERRIDE FINAL;
     virtual void paintFloats(PaintInfo&, const LayoutPoint&, bool preservePhase = false) OVERRIDE FINAL;
-    virtual void clipOutFloatingObjects(RenderBlock*, const PaintInfo*, const LayoutPoint&, const LayoutSize&) OVERRIDE;
+    virtual void clipOutFloatingObjects(const RenderBlock*, const PaintInfo*, const LayoutPoint&, const LayoutSize&) const OVERRIDE;
     void clearFloats(EClear);
 
     LayoutUnit logicalRightFloatOffsetForLine(LayoutUnit logicalTop, LayoutUnit fixedOffset, LayoutUnit logicalHeight) const;