Add foundation for trimming the AffiliationDatabase.

components/password_manager/core/browser/password_store.cc

Index: components/password_manager/core/browser/password_store.cc
diff --git a/components/password_manager/core/browser/password_store.cc b/components/password_manager/core/browser/password_store.cc
index 4a357919b33b8e81cbf8c8c2aba1dd3d5c3f4f27..08e827db22e2abd07e9bb59ca62401402e86e669 100644
--- a/components/password_manager/core/browser/password_store.cc
+++ b/components/password_manager/core/browser/password_store.cc
@@ -116,6 +116,11 @@ void PasswordStore::RemoveLoginsSyncedBetween(base::Time delete_begin,
                           this, delete_begin, delete_end));
 }
 
+void PasswordStore::TrimAffiliationCache() {
+  if (affiliated_match_helper_)
+    affiliated_match_helper_->TrimAffiliationCache();
+}
+
 void PasswordStore::GetLogins(const PasswordForm& form,
                               AuthorizationPromptPolicy prompt_policy,
                               PasswordStoreConsumer* consumer) {