MessageRecorder was removed in https://bugs.webkit.org/show_bug.cgi?id=161022 It wasn't removed from Source/WebKit2/PlatformMac.cmake which broken the cmake build.
Created attachment 286914 [details] patch
Comment on attachment 286914 [details] patch Clearing flags on attachment: 286914 Committed r204946: <http://trac.webkit.org/changeset/204946>
All reviewed patches have been landed. Closing bug.