Introduce DEFINE_RENDER_OBJECT_TYPE_CASTS to replace manual toRenderFoo, and use it

Source/core/rendering/svg/RenderSVGInlineText.h

 /*
  * Copyright (C) 2006 Oliver Hunt <ojh16@student.canterbury.ac.nz>
  * Copyright (C) 2006, 2008 Apple Inc. All rights reserved.
  * Copyright (C) 2008 Rob Buis <buis@kde.org>
  *
  * 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.
  *
@@ skipping 47 matching lines @@
     virtual PositionWithAffinity positionForPoint(const LayoutPoint&) OVERRIDE FINAL;
     virtual LayoutRect localCaretRect(InlineBox*, int caretOffset, LayoutUnit* extraWidthToEndOfLine = 0);
     virtual IntRect linesBoundingBox() const;
     virtual InlineTextBox* createTextBox();
 
     float m_scalingFactor;
     Font m_scaledFont;
     SVGTextLayoutAttributes m_layoutAttributes;
 };
 
-inline RenderSVGInlineText* toRenderSVGInlineText(RenderObject* object)
-{
-    ASSERT_WITH_SECURITY_IMPLICATION(!object || object->isSVGInlineText());
-    return static_cast<RenderSVGInlineText*>(object);
-}
-
-inline const RenderSVGInlineText* toRenderSVGInlineText(const RenderObject* object)
-{
-    ASSERT_WITH_SECURITY_IMPLICATION(!object || object->isSVGInlineText());
-    return static_cast<const RenderSVGInlineText*>(object);
-}
-
-// This will catch anyone doing an unnecessary cast.
-void toRenderSVGInlineText(const RenderSVGInlineText*);
+DEFINE_RENDER_OBJECT_TYPE_CASTS(RenderSVGInlineText, isSVGInlineText());
 
 }
 
 #endif // RenderSVGInlineText_h