This is a regression introduced during the pasteboard refactoring.
Created attachment 82371 [details]
Comment on attachment 82371 [details]
View in context: https://bugs.webkit.org/attachment.cgi?id=82371&action=review
> + // Using different API for WebKit and WebKit2.
Perhaps this should be a FIXME and explain what’s broken in the WebKit2 case (namely, no attributes) rather than just say the API is different.