Introduce DEFINE_RENDER_OBJECT_TYPE_CASTS to replace manual toRenderFoo, and use it

Source/core/rendering/RenderRubyRun.h

Index: Source/core/rendering/RenderRubyRun.h
diff --git a/Source/core/rendering/RenderRubyRun.h b/Source/core/rendering/RenderRubyRun.h
index ebf642b929695d174db2cbec181ef32fc76feabf..2005bc1322b9757d302d97180ae678561b91b71b 100644
--- a/Source/core/rendering/RenderRubyRun.h
+++ b/Source/core/rendering/RenderRubyRun.h
@@ -79,19 +79,7 @@ private:
     virtual void removeLeftoverAnonymousBlock(RenderBlock*) { }
 };
 
-inline RenderRubyRun* toRenderRubyRun(RenderObject* object)
-{
-    ASSERT_WITH_SECURITY_IMPLICATION(!object || object->isRubyRun());
-    return static_cast<RenderRubyRun*>(object);
-}
-
-inline const RenderRubyRun* toRenderRubyRun(const RenderObject* object)
-{
-    ASSERT_WITH_SECURITY_IMPLICATION(!object || object->isBox());
-    return static_cast<const RenderRubyRun*>(object);
-}
-
-void toRenderRubyRun(const RenderRubyRun*);
+DEFINE_RENDER_OBJECT_TYPE_CASTS(RenderRubyRun, isRubyRun());
 
 } // namespace WebCore