Move TransientDeviceId from MediFileSystemRegistry to RemovableStorageNotifications.

chrome/browser/media_gallery/transient_device_ids.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.
-
-// TransientDeviceIds keep track of transient IDs for removable devices, so
-// persistent device IDs are not exposed to renderers. Once a removable device
-// gets mapped to a transient ID, the mapping remains valid for the duration of
-// TransientDeviceIds' lifetime.
-
-#ifndef CHROME_BROWSER_MEDIA_GALLERY_TRANSIENT_DEVICE_IDS_H_
-#define CHROME_BROWSER_MEDIA_GALLERY_TRANSIENT_DEVICE_IDS_H_
-
-#include <map>
-#include <string>
-
-#include "base/basictypes.h"
-#include "base/threading/thread_checker.h"
-
-namespace chrome {
-
-class TransientDeviceIds {
- public:
-  TransientDeviceIds();
-  ~TransientDeviceIds();
-
-  // Returns the transient ID for a given |device_id|.
-  // |device_id| must be for a removable device.
-  // If |device_id| has never been seen before, a new, unique transient id will
-  // be assigned.
-  uint64 GetTransientIdForDeviceId(const std::string& device_id);
-
- private:
-  typedef std::map<std::string, uint64> DeviceIdToTransientIdMap;
-
-  DeviceIdToTransientIdMap id_map_;
-  uint64 next_transient_id_;
-
-  base::ThreadChecker thread_checker_;
-
-  DISALLOW_COPY_AND_ASSIGN(TransientDeviceIds);
-};
-
-}  // namespace chrome
-
-#endif  // CHROME_BROWSER_MEDIA_GALLERY_TRANSIENT_DEVICE_IDS_H_