Remove compiler feature detection for = delete

sky/engine/core/dom/Element.h

Index: sky/engine/core/dom/Element.h
diff --git a/sky/engine/core/dom/Element.h b/sky/engine/core/dom/Element.h
index e733706d8d07f858802ff4b2ac2ad199cb0916e2..126abaa03a1154e3b4eff9b1fdc7525841392d01 100644
--- a/sky/engine/core/dom/Element.h
+++ b/sky/engine/core/dom/Element.h
@@ -425,9 +425,9 @@ private:
     void clearElementFlag(ElementFlags);
     bool hasElementFlagInternal(ElementFlags) const;
 
-    bool isElementNode() const WTF_DELETED_FUNCTION; // This will catch anyone doing an unnecessary check.
-    bool isDocumentFragment() const WTF_DELETED_FUNCTION; // This will catch anyone doing an unnecessary check.
-    bool isDocumentNode() const WTF_DELETED_FUNCTION; // This will catch anyone doing an unnecessary check.
+    bool isElementNode() const = delete; // This will catch anyone doing an unnecessary check.
+    bool isDocumentFragment() const = delete; // This will catch anyone doing an unnecessary check.
+    bool isDocumentNode() const = delete; // This will catch anyone doing an unnecessary check.
 
     void styleAttributeChanged(const AtomicString& newStyleString);