Remove many delegates, let's see what breaks

chrome/browser/notifications/platform_notification_service_impl.cc

 // Copyright 2014 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/platform_notification_service_impl.h"
 
 #include <utility>
 #include <vector>
 
 #include "base/metrics/histogram_macros.h"
 #include "base/metrics/user_metrics.h"
 #include "base/metrics/user_metrics_action.h"
 #include "base/strings/utf_string_conversions.h"
 #include "base/time/time.h"
 #include "build/build_config.h"
 #include "chrome/browser/browser_process.h"
 #include "chrome/browser/content_settings/host_content_settings_map_factory.h"
 #include "chrome/browser/engagement/site_engagement_service.h"
-#include "chrome/browser/notifications/native_notification_delegate.h"
 #include "chrome/browser/notifications/notification_common.h"
 #include "chrome/browser/notifications/notification_display_service_factory.h"
 #include "chrome/browser/notifications/web_notification_delegate.h"
 #include "chrome/browser/permissions/permission_decision_auto_blocker.h"
 #include "chrome/browser/permissions/permission_manager.h"
 #include "chrome/browser/permissions/permission_result.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/browser/profiles/profile_attributes_storage.h"
 #include "chrome/browser/profiles/profile_io_data.h"
 #include "chrome/browser/profiles/profile_manager.h"
@@ skipping 517 matching lines @@
 
 void PlatformNotificationServiceImpl::RecordSiteEngagement(
     BrowserContext* browser_context,
     const GURL& origin) {
   // TODO(dominickn, peter): This would be better if the site engagement service
   // could directly observe each notification.
   SiteEngagementService* engagement_service =
       SiteEngagementService::Get(Profile::FromBrowserContext(browser_context));
   engagement_service->HandleNotificationInteraction(origin);
 }