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

ppapi/proxy/ppb_core_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_PPB_CORE_PROXY_H_
 #define PPAPI_PPB_CORE_PROXY_H_
 
 #include "ppapi/c/pp_completion_callback.h"
 #include "ppapi/c/pp_resource.h"
 #include "ppapi/c/pp_var.h"
 #include "ppapi/c/ppb_core.h"
 #include "ppapi/proxy/interface_proxy.h"
 #include "ppapi/shared_impl/host_resource.h"
 
-struct PPB_Core;
-
 namespace ppapi {
 namespace proxy {
 
 class PPB_Core_Proxy : public InterfaceProxy {
  public:
   PPB_Core_Proxy(Dispatcher* dispatcher);
   virtual ~PPB_Core_Proxy();
 
   static const PPB_Core* GetPPB_Core_Interface();
 
@@ skipping 10 matching lines @@
   // When this proxy is in the host side, this value caches the interface
   // pointer so we don't have to retrieve it from the dispatcher each time.
   // In the plugin, this value is always NULL.
   const PPB_Core* ppb_core_impl_;
 };
 
 }  // namespace proxy
 }  // namespace ppapi
 
 #endif  // PPAPI_PPB_CORE_PROXY_H_