Improve the device type constants.

chrome/browser/media_gallery/media_device_notifications_chromeos.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.
 
 // chromeos::MediaDeviceNotifications implementation.
 
 #include "chrome/browser/media_gallery/media_device_notifications_chromeos.h"
 
 #include "base/file_path.h"
 #include "base/logging.h"
@@ skipping 134 matching lines @@
   if (!GetDeviceInfo(mount_info.source_path, &unique_id, &device_label))
     return;
 
   // Keep track of device uuid, to see how often we receive empty uuid values.
   UMA_HISTOGRAM_BOOLEAN("MediaDeviceNotification.device_uuid_available",
                         !unique_id.empty());
   if (unique_id.empty())
     return;
 
   std::string device_id = chrome::MediaStorageUtil::MakeDeviceId(
-      chrome::MediaStorageUtil::USB_MASS_STORAGE_WITH_DCIM, unique_id);
+      chrome::MediaStorageUtil::REMOVABLE_MASS_STORAGE_WITH_DCIM, unique_id);
   mount_map_.insert(std::make_pair(mount_info.mount_path, device_id));
   base::SystemMonitor::Get()->ProcessRemovableStorageAttached(
       device_id,
       device_label,
       mount_info.mount_path);
 }
 
 }  // namespace chrome