Rename PPB_Flash_DeviceID interface to PPB_Flash_DRM

ppapi/thunk/ppb_flash_device_id_api.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.
-
-#include "base/memory/ref_counted.h"
-#include "ppapi/thunk/ppapi_thunk_export.h"
-
-namespace ppapi {
-
-class TrackedCallback;
-
-namespace thunk {
-
-class PPAPI_THUNK_EXPORT PPB_Flash_DeviceID_API {
- public:
-  virtual ~PPB_Flash_DeviceID_API() {}
-
-  virtual int32_t GetDeviceID(PP_Var* id,
-                              scoped_refptr<TrackedCallback> callback) = 0;
-};
-
-}  // namespace thunk
-}  // namespace ppapi
-