Make //content responsible for generating notification Ids

chrome/browser/push_messaging/push_messaging_notification_manager.h

 // 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.
 
 #ifndef CHROME_BROWSER_PUSH_MESSAGING_PUSH_MESSAGING_NOTIFICATION_MANAGER_H_
 #define CHROME_BROWSER_PUSH_MESSAGING_PUSH_MESSAGING_NOTIFICATION_MANAGER_H_
 
 #include <stdint.h>
 #include <vector>
 
@@ skipping 66 matching lines @@
                          int64_t service_worker_registration_id,
                          const base::Closure& message_handled_closure,
                          bool silent_push_allowed);
 
   static void DidWriteNotificationDataIOProxy(
       const base::WeakPtr<PushMessagingNotificationManager>& ui_weak_ptr,
       const GURL& origin,
       const content::PlatformNotificationData& notification_data,
       const base::Closure& message_handled_closure,
       bool success,
-      int64_t persistent_notification_id);
+      const std::string& notification_id);
 
   void DidWriteNotificationData(
       const GURL& origin,
       const content::PlatformNotificationData& notification_data,
       const base::Closure& message_handled_closure,
       bool success,
-      int64_t persistent_notification_id);
+      const std::string& notification_id);
 
   // Weak. This manager is owned by a keyed service on this profile.
   Profile* profile_;
 
   base::WeakPtrFactory<PushMessagingNotificationManager> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(PushMessagingNotificationManager);
 };
 
 #endif  // CHROME_BROWSER_PUSH_MESSAGING_PUSH_MESSAGING_NOTIFICATION_MANAGER_H_