AffiliationBackend: Implement the better part of on-demand fetching.

components/password_manager/core/browser/fake_affiliation_fetcher.cc

Index: components/password_manager/core/browser/fake_affiliation_fetcher.cc
diff --git a/components/password_manager/core/browser/fake_affiliation_fetcher.cc b/components/password_manager/core/browser/fake_affiliation_fetcher.cc
index 0f78e1f1abcc23817ec9f579c4f4a51fd07c0957..cb96fa73e9ff93e3dc037f00bb443a34b019b89b 100644
--- a/components/password_manager/core/browser/fake_affiliation_fetcher.cc
+++ b/components/password_manager/core/browser/fake_affiliation_fetcher.cc
@@ -39,13 +39,18 @@ password_manager::ScopedFakeAffiliationFetcherFactory::
   AffiliationFetcher::SetFactoryForTesting(nullptr);
 }
 
-FakeAffiliationFetcher* ScopedFakeAffiliationFetcherFactory::GetNextFetcher() {
+FakeAffiliationFetcher* ScopedFakeAffiliationFetcherFactory::PopNextFetcher() {
   DCHECK(!pending_fetchers_.empty());
   FakeAffiliationFetcher* first = pending_fetchers_.front();
   pending_fetchers_.pop();
   return first;
 }
 
+FakeAffiliationFetcher* ScopedFakeAffiliationFetcherFactory::PeekNextFetcher() {
+  DCHECK(!pending_fetchers_.empty());
+  return pending_fetchers_.front();
+}
+
 AffiliationFetcher* ScopedFakeAffiliationFetcherFactory::CreateInstance(
     net::URLRequestContextGetter* request_context_getter,
     const std::vector<FacetURI>& facet_ids,