The webkitgtk package will be removed from rawhide after Fedora 26 is branched due to the high number of unfixed security vulnerabilities. You must remove this dependency or your package will not be present in Fedora 27. Please refer to [1] for a FAQ on this matter and be advised that for some packages this may require a substantial amount of work. [1] https://lists.fedoraproject.org/archives/list/devel@lists.fedoraproject.org/thread/AKVB363GFCHHJ5MTHGVYHYT6NLLTF5VM/
Atril-1.16.x in f25 was switched to gtk3 and webkitgtk4 some months ago. http://pkgs.fedoraproject.org/cgit/rpms/atril.git/commit/?h=f25&id=11de6895c0fd6bc8349891861bb97222fe265aa0 To be sure, is the package webkitgtk4 in fedora webkit2 ?
Yup. Looks like you're good.