Rename PPB_Flash_DeviceID interface to PPB_Flash_DRM

ppapi/thunk/ppb_flash_drm_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/c/private/ppb_flash_drm.h"
 #include "ppapi/thunk/ppapi_thunk_export.h"
 
 namespace ppapi {
 
 class TrackedCallback;
 
 namespace thunk {
 
-class PPAPI_THUNK_EXPORT PPB_Flash_DeviceID_API {
+class PPAPI_THUNK_EXPORT PPB_Flash_DRM_API {
  public:
-  virtual ~PPB_Flash_DeviceID_API() {}
+  virtual ~PPB_Flash_DRM_API() {}
 
   virtual int32_t GetDeviceID(PP_Var* id,
                               scoped_refptr<TrackedCallback> callback) = 0;
 };
 
 }  // namespace thunk
 }  // namespace ppapi