Remove many delegates, let's see what breaks

chrome/browser/notifications/native_notification_delegate.cc

Index: chrome/browser/notifications/native_notification_delegate.cc
diff --git a/chrome/browser/notifications/native_notification_delegate.cc b/chrome/browser/notifications/native_notification_delegate.cc
deleted file mode 100644
index 26c0b6d334f3b8e1b156de3ab66ed6dda82e3754..0000000000000000000000000000000000000000
--- a/chrome/browser/notifications/native_notification_delegate.cc
+++ /dev/null
@@ -1,9 +0,0 @@
-// Copyright 2017 The Chromium Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-#include "chrome/browser/notifications/native_notification_delegate.h"
-
-std::string NativeNotificationDelegate::id() const {
-  return notification_id_;
-}