The problem is that CFURLCacheSharedURLCache isn't exported by the CoreNetwork.dll that comes with Safari 4.
Reverting 42565 fixes the issue. Not sure if that's the long term solution, or the correct dll will be pushed out.
Created attachment 31143 [details]
Added a patch
Not sure if the source should be updated, or whether there's a version of the DLLs coming out soon that's compatible. At the very least, others who're having this issue can apply this patch.
Reverting that change seems fine for now, and will work both before and after we update the headers to CFNetwork used by the open source project.
Committed in @r44609.
Thanks for committing it for me.