Add foundation for trimming the AffiliationDatabase.

components/password_manager/core/browser/facet_manager.cc

Index: components/password_manager/core/browser/facet_manager.cc
diff --git a/components/password_manager/core/browser/facet_manager.cc b/components/password_manager/core/browser/facet_manager.cc
index ea84f50ea2dff47a0ba20b1461bfa3be4f37fbb6..a0e9e8667371d41689ca49145dd1e0df4b6efc9c 100644
--- a/components/password_manager/core/browser/facet_manager.cc
+++ b/components/password_manager/core/browser/facet_manager.cc
@@ -187,6 +187,11 @@ bool FacetManager::CanBeDiscarded() const {
          GetMaximumKeepFreshUntilThreshold() <= clock_->Now();
 }
 
+bool FacetManager::CanCachedDataBeDiscarded() const {
+  return GetMaximumKeepFreshUntilThreshold() <= clock_->Now() ||
+         !IsCachedDataFresh();
+}
+
 bool FacetManager::DoesRequireFetch() const {
   return (!pending_requests_.empty() && !IsCachedDataFresh()) ||
          GetNextRequiredFetchTimeDueToPrefetch() <= clock_->Now();