Extract and dispatch device uuid in media device attached notification message.

chrome/browser/media_gallery/media_device_notifications_chromeos.h

 // 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.
 
 // chromeos::MediaDeviceNotifications listens for mount point changes and
 // notifies the SystemMonitor about the addition and deletion of media devices.
 
 #ifndef CHROME_BROWSER_MEDIA_GALLERY_MEDIA_DEVICE_NOTIFICATIONS_CHROMEOS_H_
 #define CHROME_BROWSER_MEDIA_GALLERY_MEDIA_DEVICE_NOTIFICATIONS_CHROMEOS_H_
 
@@ skipping 39 matching lines @@
   // Checks if the mount point in |mount_info| is a media device. If it is,
   // then continue with AddMountedPathOnUIThread() below.
   void CheckMountedPathOnFileThread(
       const disks::DiskMountManager::MountPointInfo& mount_info);
 
   // Adds the mount point in |mount_info| to |mount_map_| and send a media
   // device attach notification.
   void AddMountedPathOnUIThread(
       const disks::DiskMountManager::MountPointInfo& mount_info);
 
-  // The lowest available device id number.
-  // Only accessed on the UI thread.
-  // TODO(thestig) Remove this and use a device UUID instead.
-  int current_device_id_;
-
   // Mapping of relevant mount points and their corresponding mount devices.
   // Only accessed on the UI thread.
   MountMap mount_map_;
 
   DISALLOW_COPY_AND_ASSIGN(MediaDeviceNotifications);
 };
 
 }  // namespace chromeos
 
 #endif  // CHROME_BROWSER_MEDIA_GALLERY_MEDIA_DEVICE_NOTIFICATIONS_CHROMEOS_H_