Fix unified build due to missing header include.
<rdar://problem/75081020>
Created attachment 422339 [details] Patch
Tools/Scripts/svn-apply failed to apply attachment 422339 [details] to trunk. Please resolve the conflicts and upload a new patch.
Created attachment 422624 [details] Patch
Comment on attachment 422624 [details] Patch already reviewed
Committed r274115: <https://commits.webkit.org/r274115> All reviewed patches have been landed. Closing bug and clearing flags on attachment 422624 [details].