Do not delete notification ids unknown by the display service

content/browser/notifications/platform_notification_context_impl.cc

 // Copyright 2015 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 "content/browser/notifications/platform_notification_context_impl.h"
 
 #include "base/bind_helpers.h"
 #include "base/files/file_util.h"
 #include "base/memory/ptr_util.h"
 #include "base/metrics/histogram_macros.h"
@@ skipping 234 matching lines @@
 
   std::vector<NotificationDatabaseData> notification_datas;
 
   NotificationDatabase::Status status =
       database_->ReadAllNotificationDataForServiceWorkerRegistration(
           origin, service_worker_registration_id, &notification_datas);
 
   UMA_HISTOGRAM_ENUMERATION("Notifications.Database.ReadForServiceWorkerResult",
                             status, NotificationDatabase::STATUS_COUNT);
 
-  std::vector<std::string> obsolete_notifications;
-
   if (status == NotificationDatabase::STATUS_OK) {
     if (synchronization_supported) {
+      // Filter out notifications that are not actually on display anymore.
+      // TODO(miguelg) synchronize the database if there are inconsistencies.
       for (auto it = notification_datas.begin();
            it != notification_datas.end();) {
         // The database is only used for persistent notifications.
         DCHECK(NotificationIdGenerator::IsPersistentNotification(
             it->notification_id));
         if (displayed_notifications->count(it->notification_id)) {
           ++it;
         } else {
-          obsolete_notifications.push_back(it->notification_id);
           it = notification_datas.erase(it);
         }
       }
     }
 
     BrowserThread::PostTask(
         BrowserThread::IO, FROM_HERE,
         base::Bind(callback, true /* success */, notification_datas));
-
-    // Remove notifications that are not actually on display anymore.
-    for (const auto& it : obsolete_notifications)
-      database_->DeleteNotificationData(it, origin);
     return;
   }
 
   // Blow away the database if reading data failed due to corruption.
   if (status == NotificationDatabase::STATUS_ERROR_CORRUPTED)
     DestroyDatabase();
 
   BrowserThread::PostTask(BrowserThread::IO, FROM_HERE,
                           base::Bind(callback, false /* success */,
                                      std::vector<NotificationDatabaseData>()));
@@ skipping 249 matching lines @@
 
   return path_.Append(kPlatformNotificationsDirectory);
 }
 
 void PlatformNotificationContextImpl::SetTaskRunnerForTesting(
     const scoped_refptr<base::SequencedTaskRunner>& task_runner) {
   task_runner_ = task_runner;
 }
 
 }  // namespace content