Introduce a new API to handle native notification clicks

chrome/browser/notifications/persistent_notification_delegate.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/persistent_notification_delegate.h"
 
 #include "base/bind.h"
 #include "base/guid.h"
+#include "chrome/browser/notifications/notification_operation_common.h"
 #include "chrome/browser/notifications/platform_notification_service_impl.h"
 #include "content/public/common/persistent_notification_status.h"
 
 PersistentNotificationDelegate::PersistentNotificationDelegate(
     content::BrowserContext* browser_context,
     int64_t persistent_notification_id,
     const GURL& origin,
     int notification_settings_index)
     : browser_context_(browser_context),
       persistent_notification_id_(persistent_notification_id),
@@ skipping 17 matching lines @@
   PlatformNotificationServiceImpl::GetInstance()->OnPersistentNotificationClick(
       browser_context_,
       persistent_notification_id_,
       origin_,
       -1 /* action_index */);
 }
 
 void PersistentNotificationDelegate::ButtonClick(int button_index) {
   DCHECK_GE(button_index, 0);
   if (button_index == notification_settings_index_) {
-    PlatformNotificationServiceImpl::GetInstance()->OpenNotificationSettings(
-        browser_context_);
+    notification_operation_common::OpenNotificationSettings(browser_context_);
     return;
   }
 
   PlatformNotificationServiceImpl::GetInstance()->OnPersistentNotificationClick(
       browser_context_,
       persistent_notification_id_,
       origin_,
       button_index);
 }
 
 void PersistentNotificationDelegate::SettingsClick() {
-  PlatformNotificationServiceImpl::GetInstance()->OpenNotificationSettings(
-      browser_context_);
+  notification_operation_common::OpenNotificationSettings(browser_context_);
   return;
 }
 
 bool PersistentNotificationDelegate::ShouldDisplaySettingsButton() {
   return true;
 }
 
 std::string PersistentNotificationDelegate::id() const {
   return id_;
 }