Refactor notification operation functionality out of PNS

chrome/browser/notifications/notification_object_proxy.cc

 // Copyright (c) 2012 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/notification_object_proxy.h"
 
 #include <utility>
 
 #include "base/guid.h"
 #include "base/logging.h"
+#include "chrome/browser/notifications/notification_common.h"
 #include "chrome/browser/notifications/platform_notification_service_impl.h"
 #include "content/public/browser/desktop_notification_delegate.h"
 
 NotificationObjectProxy::NotificationObjectProxy(
     content::BrowserContext* browser_context,
     std::unique_ptr<content::DesktopNotificationDelegate> delegate)
     : browser_context_(browser_context),
       delegate_(std::move(delegate)),
       displayed_(false),
       id_(base::GenerateGUID()) {}
@@ skipping 14 matching lines @@
   delegate_->NotificationClosed();
 }
 
 void NotificationObjectProxy::Click() {
   delegate_->NotificationClick();
 }
 
 void NotificationObjectProxy::ButtonClick(int button_index) {
   // Notification buttons not are supported for non persistent notifications.
   DCHECK_EQ(button_index, 0);
-  PlatformNotificationServiceImpl::GetInstance()->OpenNotificationSettings(
-      browser_context_);
+  NotificationCommon::OpenNotificationSettings(browser_context_);
 }
 
 void NotificationObjectProxy::SettingsClick() {
-  PlatformNotificationServiceImpl::GetInstance()->OpenNotificationSettings(
-      browser_context_);
+  NotificationCommon::OpenNotificationSettings(browser_context_);
   return;
 }
 
 bool NotificationObjectProxy::ShouldDisplaySettingsButton() {
   return true;
 }
 
 std::string NotificationObjectProxy::id() const {
   return id_;
 }