Remove setDomainForCachePartition from loadURL since it will be overwritten in DocumentLoader::loadMainResource, this was introduced by r213126.
Created attachment 395510 [details] Patch
Committed r259566: <https://trac.webkit.org/changeset/259566> All reviewed patches have been landed. Closing bug and clearing flags on attachment 395510 [details].
<rdar://problem/61330343>