Add foundation for trimming the AffiliationDatabase.

chrome/browser/password_manager/password_store_factory.h

Index: chrome/browser/password_manager/password_store_factory.h
diff --git a/chrome/browser/password_manager/password_store_factory.h b/chrome/browser/password_manager/password_store_factory.h
index 25bd74720378840075a0374eca927c2a4389e0b2..5fab46e3fe7ec2529179739b67d6839a7485e6bb 100644
--- a/chrome/browser/password_manager/password_store_factory.h
+++ b/chrome/browser/password_manager/password_store_factory.h
@@ -62,6 +62,10 @@ class PasswordStoreFactory : public BrowserContextKeyedServiceFactory {
   // that syncing passwords has just started or ended for |profile|.
   static void OnPasswordsSyncedStatePotentiallyChanged(Profile* profile);
 
+  // Trims the affiliation cache for |profile| if affiliation-based matching is
+  // enabled, and completely deletes it otherwise.
+  static void TrimOrDeleteAffiliationCache(Profile* profile);
+
  private:
   friend struct DefaultSingletonTraits<PasswordStoreFactory>;