Update PPAPI IDL generator to define versioned structs, and unversioned typedef.

ppapi/proxy/ppb_flash_clipboard_proxy.h

 // Copyright (c) 2011 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_PROXY_PPB_FLASH_CLIPBOARD_PROXY_H_
 #define PPAPI_PROXY_PPB_FLASH_CLIPBOARD_PROXY_H_
 
 #include "ppapi/c/pp_instance.h"
 #include "ppapi/proxy/interface_proxy.h"
 #include "ppapi/thunk/ppb_flash_clipboard_api.h"
 
-struct PPB_Flash_Clipboard;
-
 namespace ppapi {
 namespace proxy {
 
 class SerializedVarReceiveInput;
 class SerializedVarReturnValue;
 
 class PPB_Flash_Clipboard_Proxy
     : public InterfaceProxy,
       public thunk::PPB_Flash_Clipboard_FunctionAPI {
  public:
@@ skipping 30 matching lines @@
                           SerializedVarReturnValue result);
   void OnMsgWritePlainText(PP_Instance instance,
                            int clipboard_type,
                            SerializedVarReceiveInput text);
 };
 
 }  // namespace proxy
 }  // namespace ppapi
 
 #endif  // PPAPI_PROXY_PPB_FLASH_CLIPBOARD_PROXY_H_