[ 2542s] ../../services/network/cookie_access_delegate_impl.cc: In member function 'virtual std::optional<base::flat_map<net::SchemefulSite, net::FirstPartySetEntry> > network::CookieAccessDelegateImpl::FindFirstPartySetEntries(base::flat_set<net::SchemefulSite>&, base::OnceCallback<void(base::flat_map<net::SchemefulSite, net::FirstPartySetEntry>)>) const':
[ 2542s] ../../services/network/cookie_access_delegate_impl.cc:81:15: error: converting to 'std::optional<base::flat_map<net::SchemefulSite, net::FirstPartySetEntry> >' from initializer list would use explicit constructor 'constexpr std::optional<_Tp>::optional(std::in_place_t, _Args&& ...) [with _Args = {}; typename std::enable_if<__and_v<std::is_constructible<_Tp, _Args ...> >, bool>::type <anonymous> = false; _Tp = base::flat_map<net::SchemefulSite, net::FirstPartySetEntry>]'
[ 2542s] 81 | return {{}};
[ 2542s] | ^
[ 2542s] ../../services/network/cookie_access_delegate_impl.cc:81:15: error: converting to 'std::in_place_t' from initializer list would use explicit constructor 'constexpr std::in_place_t::in_place_t()'