Remove the old PPB_Flash proxy.

ppapi/thunk/ppb_flash_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.
-
-#ifndef PPAPI_THUNK_PPB_FLASH_API_H_
-#define PPAPI_THUNK_PPB_FLASH_API_H_
-
-#include "ppapi/c/private/ppb_flash.h"
-#include "ppapi/thunk/ppapi_thunk_export.h"
-
-namespace ppapi {
-namespace thunk {
-
-/////////////////////////// WARNING:DEPRECTATED ////////////////////////////////
-// Please do not add any new functions to this API. They should be implemented
-// in the new-style resource proxy (see flash_functions_api.h and
-// flash_resource.h).
-// TODO(raymes): All of these functions should be moved to
-// flash_functions_api.h.
-////////////////////////////////////////////////////////////////////////////////
-// This class collects all of the Flash interface-related APIs into one place.
-class PPAPI_THUNK_EXPORT PPB_Flash_API {
- public:
-  virtual ~PPB_Flash_API() {}
-};
-
-}  // namespace thunk
-}  // namespace ppapi
-
-#endif // PPAPI_THUNK_PPB_FLASH_API_H_