void SchemeRegistry::setDomainRelaxationForbiddenForURLScheme(bool forbidden, const String& scheme)
{
    if (scheme.isEmpty())
        return;

    if (forbidden)
        schemesForbiddenFromDomainRelaxation().add(scheme);
    else
        schemesForbiddenFromDomainRelaxation().remove(scheme);
}
bool SchemeRegistry::isDomainRelaxationForbiddenForURLScheme(const String& scheme)
{
    if (scheme.isEmpty())
        return false;
    MutexLocker locker(mutex());
    return schemesForbiddenFromDomainRelaxation().contains(scheme);
}