Delete PasswordStoreMac and SimplePasswordStoreMac.

components/password_manager/core/browser/password_store_default.h

Index: components/password_manager/core/browser/password_store_default.h
diff --git a/components/password_manager/core/browser/password_store_default.h b/components/password_manager/core/browser/password_store_default.h
index 0c7faebef2dc6b03ae2a6af780d7de42ab138c17..be550455606d2e1be8a9a967c8f83736c7e0d3c0 100644
--- a/components/password_manager/core/browser/password_store_default.h
+++ b/components/password_manager/core/browser/password_store_default.h
@@ -34,7 +34,7 @@ class PasswordStoreDefault : public PasswordStore {
 
   void ShutdownOnUIThread() override;
 
-  // To be used only for testing.
+  // To be used only for testing or in subclasses.
   LoginDatabase* login_db() const { return login_db_.get(); }
 
  protected:
@@ -86,10 +86,6 @@ class PasswordStoreDefault : public PasswordStore {
     return login_db_->DeleteAndRecreateDatabaseFile();
   }
 
-  void set_login_db(std::unique_ptr<password_manager::LoginDatabase> login_db) {
-    login_db_.swap(login_db);
-  }
-
  private:
   // Resets |login_db_| on the background thread.
   void ResetLoginDB();