Looks like we always create UIWebFormAccessory on WKContentView even when we don't require accessory view (requiresAccessoryView is false).
<rdar://problem/21913247>
Created attachment 257493 [details] Patch.
Comment on attachment 257493 [details] Patch. Clearing flags on attachment: 257493 Committed r187376: <http://trac.webkit.org/changeset/187376>
All reviewed patches have been landed. Closing bug.