A VS2013 compiler workaround can be removed now. Also, the precompiled header for WebKitQuartzCoreAdditions is unused, and can be removed.
Created attachment 375937 [details] Patch
Thanks for reviewing! I might have spoken a bit too soon about the precompiled header not being used, waiting for EWS before landing.
Created attachment 375939 [details] Patch
Comment on attachment 375939 [details] Patch Clearing flags on attachment: 375939 Committed r248472: <https://trac.webkit.org/changeset/248472>
<rdar://problem/54142654>