Introduce DEFINE_RENDER_OBJECT_TYPE_CASTS to replace manual toRenderFoo, and use it

Source/core/rendering/svg/RenderSVGText.h

Index: Source/core/rendering/svg/RenderSVGText.h
diff --git a/Source/core/rendering/svg/RenderSVGText.h b/Source/core/rendering/svg/RenderSVGText.h
index fa1f652e8b5bd3ef12110d0fe75c4ae5df659d47..56fb0db8e4962c282bf483ed1d519bfcb761b435 100644
--- a/Source/core/rendering/svg/RenderSVGText.h
+++ b/Source/core/rendering/svg/RenderSVGText.h
@@ -101,20 +101,7 @@ private:
     Vector<SVGTextLayoutAttributes*> m_layoutAttributes;
 };
 
-inline RenderSVGText* toRenderSVGText(RenderObject* object)
-{
-    ASSERT_WITH_SECURITY_IMPLICATION(!object || object->isSVGText());
-    return static_cast<RenderSVGText*>(object);
-}
-
-inline const RenderSVGText* toRenderSVGText(const RenderObject* object)
-{
-    ASSERT_WITH_SECURITY_IMPLICATION(!object || object->isSVGText());
-    return static_cast<const RenderSVGText*>(object);
-}
-
-// This will catch anyone doing an unnecessary cast.
-void toRenderSVGText(const RenderSVGText*);
+DEFINE_RENDER_OBJECT_TYPE_CASTS(RenderSVGText, isSVGText());
 
 }