156     referrers_[referring_url].SuggestHost(target_url);  in LearnFromNavigation()
260   Referrers::iterator it = referrers_.find(url);  in PrepareFrameSubresources()
261   if (referrers_.end() == it) {  in PrepareFrameSubresources()
370   if (referrers_.empty())  in GetHtmlReferrerLists()
379   for (Referrers::iterator it = referrers_.begin();  in GetHtmlReferrerLists()
380        referrers_.end() != it; ++it)  in GetHtmlReferrerLists()
395     Referrer* referrer = &(referrers_[*it]);  in GetHtmlReferrerLists()
564   referrers_.clear();  in DiscardAllResults()
612   for (Referrers::const_iterator it = referrers_.begin();  in SerializeReferrers()
613        it != referrers_.end(); ++it) {  in SerializeReferrers()
650       referrers_[GURL(motivating_url_spec)].Deserialize(*subresource_list);  in DeserializeReferrers()
672   for (Referrers::const_iterator it = referrers_.begin();  in LoadUrlsForTrimming()
673        it != referrers_.end(); ++it)  in LoadUrlsForTrimming()
693     Referrers::iterator it = referrers_.find(urls_being_trimmed_.back());  in IncrementalTrimReferrers()
695     if (it == referrers_.end())  in IncrementalTrimReferrers()
698       referrers_.erase(it);  in IncrementalTrimReferrers()