Introduce DEFINE_RENDER_OBJECT_TYPE_CASTS to replace manual toRenderFoo, and use it

Source/core/rendering/RenderListMarker.h

Index: Source/core/rendering/RenderListMarker.h
diff --git a/Source/core/rendering/RenderListMarker.h b/Source/core/rendering/RenderListMarker.h
index c8a086790d96853998c4e9a511b1a07829a46a31..d0002ffb973e448bc27e6c82523c2594b60e8776 100644
--- a/Source/core/rendering/RenderListMarker.h
+++ b/Source/core/rendering/RenderListMarker.h
@@ -86,20 +86,7 @@ private:
     RenderListItem* m_listItem;
 };
 
-inline RenderListMarker* toRenderListMarker(RenderObject* object)
-{
-    ASSERT_WITH_SECURITY_IMPLICATION(!object || object->isListMarker());
-    return static_cast<RenderListMarker*>(object);
-}
-
-inline const RenderListMarker* toRenderListMarker(const RenderObject* object)
-{
-    ASSERT_WITH_SECURITY_IMPLICATION(!object || object->isListMarker());
-    return static_cast<const RenderListMarker*>(object);
-}
-
-// This will catch anyone doing an unnecessary cast.
-void toRenderListMarker(const RenderListMarker*);
+DEFINE_RENDER_OBJECT_TYPE_CASTS(RenderListMarker, isListMarker());
 
 } // namespace WebCore