There's no need for gCustomPasteboardDataEnabled anymore.
Created attachment 333563 [details] Patch
Comment on attachment 333563 [details] Patch r=me
Comment on attachment 333563 [details] Patch Clearing flags on attachment: 333563 Committed r228367: <https://trac.webkit.org/changeset/228367>
All reviewed patches have been landed. Closing bug.
<rdar://problem/37429119>