Use tighter typing in table rendering code

Source/core/rendering/RenderTableSection.h

Index: Source/core/rendering/RenderTableSection.h
diff --git a/Source/core/rendering/RenderTableSection.h b/Source/core/rendering/RenderTableSection.h
index 6d87ea2af2118365e162d6fa658ef2b4c1a14cf9..27410d5b14ea3598597811024bd4b0a5cf673a4a 100644
--- a/Source/core/rendering/RenderTableSection.h
+++ b/Source/core/rendering/RenderTableSection.h
@@ -4,7 +4,7 @@
  *           (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
@@ -65,9 +65,8 @@ 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; }
@@ -220,6 +219,7 @@ public:
 
 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(); }
@@ -238,8 +238,6 @@ private:
 
     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);