Remove SafeBrowsingResult since it's not used (and not even built):
$ egrep -l -r '\bSafeBrowsingResult' Source/WebKit
Created attachment 385801 [details]
Comment on attachment 385801 [details]
Clearing flags on attachment: 385801
Committed r253640: <https://trac.webkit.org/changeset/253640>
All reviewed patches have been landed. Closing bug.