Get rid of WebContextMenuClient::customizeMenu, it's no longer used
Created attachment 263770 [details] Patch
Committed r191422: <http://trac.webkit.org/changeset/191422>
http://trac.webkit.org/changeset/191428 :(
fixes landed in https://trac.webkit.org/changeset/191434 and in https://trac.webkit.org/changeset/191436