Wincairo build seems to be broken recently. build.webkit.org: https://build.webkit.org/builders/WinCairo%2064-bit%20WKL%20Release%20%28Build%29/builds/13135/steps/compile-webkit/logs/stdio EWS failure: https://ews-build.webkit.org/#/builders/12/builds/9515 Error: C:\WebKit-BuildWorker\wincairo-wkl-release\build\WebKitBuild\Release\WTF\Headers\wtf/Ref.h(60): error C2039: 'deref': is not a member of 'WebCore::ServiceWorkerContainer::jobResolvedWithRegistration::<lambda_15d02b0ed0ed8a019a7c5a8c399d9636>'
I think this is the same protectedThis bug from r250793 (bug 202603) and r250797 (bug 202590).
Committed r251999: <https://trac.webkit.org/changeset/251999>
<rdar://problem/56869417>
*** Bug 203801 has been marked as a duplicate of this bug. ***