Delete deprecated synced notifications code

chrome/browser/notifications/sync_notifier/chrome_notifier_service_factory.h

-// Copyright (c) 2013 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.
-
-#ifndef CHROME_BROWSER_NOTIFICATIONS_SYNC_NOTIFIER_CHROME_NOTIFIER_SERVICE_FACTORY_H_
-#define CHROME_BROWSER_NOTIFICATIONS_SYNC_NOTIFIER_CHROME_NOTIFIER_SERVICE_FACTORY_H_
-
-#include "base/memory/singleton.h"
-#include "chrome/browser/profiles/profile.h"
-#include "components/keyed_service/content/browser_context_keyed_service_factory.h"
-
-namespace base {
-class CommandLine;
-}
-
-namespace notifier {
-
-class ChromeNotifierService;
-
-class ChromeNotifierServiceFactory : public BrowserContextKeyedServiceFactory {
- public:
-  static ChromeNotifierService* GetForProfile(
-      Profile* profile, Profile::ServiceAccessType service_access_type);
-
-  static ChromeNotifierServiceFactory* GetInstance();
-
-  // Based on command line switches, make the call to use SyncedNotifications or
-  // not.
-  // TODO(petewil): Remove this when the SyncedNotifications feature is ready
-  // to be turned on by default, and just use a disable switch instead then.
-  static bool UseSyncedNotifications(base::CommandLine* command_line);
-
- private:
-  friend struct DefaultSingletonTraits<ChromeNotifierServiceFactory>;
-
-  ChromeNotifierServiceFactory();
-  ~ChromeNotifierServiceFactory() override;
-
-  // BrowserContextKeyedServiceFactory:
-  KeyedService* BuildServiceInstanceFor(
-      content::BrowserContext* profile) const override;
-};
-
-}  // namespace notifier
-
-#endif  // CHROME_BROWSER_NOTIFICATIONS_SYNC_NOTIFIER_CHROME_NOTIFIER_SERVICE_FACTORY_H_