LibWeb: Convert the CSS namespace object to ThrowCompletionOr

Author: https://github.com/trflynn89
Commit: 0f93c9d6c8
Pull-request: https://github.com/SerenityOS/serenity/pull/10727
Reviewed-by: https://github.com/linusg ✅

Userland/Libraries/LibWeb/Bindings/CSSNamespace.h

@@ -21,8 +21,8 @@ public:
     virtual ~CSSNamespace() override;
 
 private:
-    JS_DECLARE_OLD_NATIVE_FUNCTION(escape);
-    JS_DECLARE_OLD_NATIVE_FUNCTION(supports);
+    JS_DECLARE_NATIVE_FUNCTION(escape);
+    JS_DECLARE_NATIVE_FUNCTION(supports);
 };
 
 }