Minimize RenderObject* casting to RenderText*

Source/core/rendering/InlineTextBox.h

Index: Source/core/rendering/InlineTextBox.h
diff --git a/Source/core/rendering/InlineTextBox.h b/Source/core/rendering/InlineTextBox.h
index ebe627843365c79e2106a0bdc84dc197554d7fd3..36f4f0d03658ee732389eca9a0e519c15a94dda5 100644
--- a/Source/core/rendering/InlineTextBox.h
+++ b/Source/core/rendering/InlineTextBox.h
@@ -49,6 +49,8 @@ public:
     {
     }
 
+    RenderText& renderer() const { return toRenderText(InlineBox::renderer()); }
+
     virtual void destroy() OVERRIDE FINAL;
 
     InlineTextBox* prevTextBox() const { return m_prevTextBox; }
@@ -115,9 +117,6 @@ protected:
     virtual void paint(PaintInfo&, const LayoutPoint&, LayoutUnit lineTop, LayoutUnit lineBottom) OVERRIDE;
     virtual bool nodeAtPoint(const HitTestRequest&, HitTestResult&, const HitTestLocation& locationInContainer, const LayoutPoint& accumulatedOffset, LayoutUnit lineTop, LayoutUnit lineBottom) OVERRIDE;
 
-public:
-    RenderText& textRenderer() const { return toRenderText(renderer()); }
-
 private:
     virtual void deleteLine() OVERRIDE FINAL;
     virtual void extractLine() OVERRIDE FINAL;