Use tighter typing in table rendering code

Source/core/rendering/RenderTableSection.h

 /*
  * Copyright (C) 1997 Martin Jones (mjones@kde.org)
  *           (C) 1997 Torben Weis (weis@kde.org)
  *           (C) 1998 Waldo Bastian (bastian@kde.org)
  *           (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
- * Copyright (C) 2003, 2004, 2005, 2006, 2009 Apple Inc. All rights reserved.
+ * Copyright (C) 2003, 2004, 2005, 2006, 2009, 2013 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.
  *
  * This library is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  * Library General Public License for more details.
@@ skipping 40 matching lines @@
 };
 
 class RenderTableCell;
 class RenderTableRow;
 
 class RenderTableSection FINAL : public RenderBox {
 public:
     RenderTableSection(Element*);
     virtual ~RenderTableSection();
 
-    // FIXME: These methods should return a RenderTableRow.
-    RenderObject* firstChild() const { ASSERT(children() == virtualChildren()); return children()->firstChild(); }
-    RenderObject* lastChild() const { ASSERT(children() == virtualChildren()); return children()->lastChild(); }
+    RenderTableRow* firstRow() const;
+    RenderTableRow* lastRow() const;
 
     const RenderObjectChildList* children() const { return &m_children; }
     RenderObjectChildList* children() { return &m_children; }
 
     virtual void addChild(RenderObject* child, RenderObject* beforeChild = 0) OVERRIDE;
 
     virtual int firstLineBoxBaseline() const OVERRIDE;
 
     void addCell(RenderTableCell*, RenderTableRow* row);
 
@@ skipping 132 matching lines @@
     static RenderTableSection* createAnonymousWithParentRenderer(const RenderObject*);
     virtual RenderBox* createAnonymousBoxWithSameTypeAs(const RenderObject* parent) const OVERRIDE
     {
         return createAnonymousWithParentRenderer(parent);
     }
 
     virtual void paint(PaintInfo&, const LayoutPoint&) OVERRIDE;
 
 protected:
     virtual void styleDidChange(StyleDifference, const RenderStyle* oldStyle) OVERRIDE;
+    virtual bool nodeAtPoint(const HitTestRequest&, HitTestResult&, const HitTestLocation& locationInContainer, const LayoutPoint& accumulatedOffset, HitTestAction) OVERRIDE;
 
 private:
     virtual RenderObjectChildList* virtualChildren() OVERRIDE { return children(); }
     virtual const RenderObjectChildList* virtualChildren() const OVERRIDE { return children(); }
 
     virtual const char* renderName() const OVERRIDE { return (isAnonymous() || isPseudoElement()) ? "RenderTableSection (anonymous)" : "RenderTableSection"; }
 
     virtual bool isTableSection() const OVERRIDE { return true; }
 
     virtual void willBeRemovedFromTree() OVERRIDE;
 
     virtual void layout() OVERRIDE;
 
     void paintCell(RenderTableCell*, PaintInfo&, const LayoutPoint&);
     virtual void paintObject(PaintInfo&, const LayoutPoint&) OVERRIDE;
 
     virtual void imageChanged(WrappedImagePtr, const IntRect* = 0) OVERRIDE;
 
-    virtual bool nodeAtPoint(const HitTestRequest&, HitTestResult&, const HitTestLocation& locationInContainer, const LayoutPoint& accumulatedOffset, HitTestAction) OVERRIDE;
-
     int borderSpacingForRow(unsigned row) const { return m_grid[row].rowRenderer ? table()->vBorderSpacing() : 0; }
 
     void ensureRows(unsigned);
 
     bool rowHasOnlySpanningCells(unsigned);
     unsigned calcRowHeightHavingOnlySpanningCells(unsigned);
     void updateRowsHeightHavingOnlySpanningCells(RenderTableCell*, struct SpanningRowsHeight&);
     bool isHeightNeededForRowHavingOnlySpanningCells(unsigned);
 
     void populateSpanningRowsHeightFromCell(RenderTableCell*, struct SpanningRowsHeight&);
@@ skipping 54 matching lines @@
     // This map holds the collapsed border values for cells with collapsed borders.
     // It is held at RenderTableSection level to spare memory consumption by table cells.
     HashMap<pair<const RenderTableCell*, int>, CollapsedBorderValue > m_cellsCollapsedBorders;
 };
 
 DEFINE_RENDER_OBJECT_TYPE_CASTS(RenderTableSection, isTableSection());
 
 } // namespace WebCore
 
 #endif // RenderTableSection_h