void TopSitesImpl::ClearBlacklistedURLs() {
  DCHECK(thread_checker_.CalledOnValidThread());
  {
    DictionaryPrefUpdate update(pref_service_, kMostVisitedURLsBlacklist);
    base::DictionaryValue* blacklist = update.Get();
    blacklist->Clear();
  }
  ResetThreadSafeCache();
  NotifyTopSitesChanged(TopSitesObserver::ChangeReason::BLACKLIST);
}

The product exposes sensitive information to an actor that is not explicitly authorized to have access to that information.