Introduce DEFINE_RENDER_OBJECT_TYPE_CASTS to replace manual toRenderFoo, and use it

Source/core/rendering/svg/RenderSVGShape.h

Index: Source/core/rendering/svg/RenderSVGShape.h
diff --git a/Source/core/rendering/svg/RenderSVGShape.h b/Source/core/rendering/svg/RenderSVGShape.h
index e4933067a345c1181061ff949f762d0f9c02b173..4cd4fb7a0ff6482f190aca6cd5f86ed7453f8d97 100644
--- a/Source/core/rendering/svg/RenderSVGShape.h
+++ b/Source/core/rendering/svg/RenderSVGShape.h
@@ -123,20 +123,7 @@ private:
     bool m_needsTransformUpdate : 1;
 };
 
-inline RenderSVGShape* toRenderSVGShape(RenderObject* object)
-{
-    ASSERT_WITH_SECURITY_IMPLICATION(!object || object->isSVGShape());
-    return static_cast<RenderSVGShape*>(object);
-}
-
-inline const RenderSVGShape* toRenderSVGShape(const RenderObject* object)
-{
-    ASSERT_WITH_SECURITY_IMPLICATION(!object || object->isSVGShape());
-    return static_cast<const RenderSVGShape*>(object);
-}
-
-// This will catch anyone doing an unnecessary cast.
-void toRenderSVGShape(const RenderSVGShape*);
+DEFINE_RENDER_OBJECT_TYPE_CASTS(RenderSVGShape, isSVGShape());
 
 }