PPAPI/NaCl: Move handle extraction code to ppapi/proxy

ppapi/proxy/ppb_buffer_proxy.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_PROXY_PPB_BUFFER_PROXY_H_
 #define PPAPI_PROXY_PPB_BUFFER_PROXY_H_
 
 #include "base/shared_memory.h"
 #include "ppapi/c/pp_instance.h"
 #include "ppapi/proxy/interface_proxy.h"
-#include "ppapi/proxy/serialized_structs.h"
 #include "ppapi/shared_impl/resource.h"
 #include "ppapi/thunk/ppb_buffer_api.h"
 
 namespace ppapi {
 
 class HostResource;
 
 namespace proxy {
 
+class SerializedHandle;
+
 class Buffer : public thunk::PPB_Buffer_API, public Resource {
  public:
   Buffer(const HostResource& resource,
          const base::SharedMemoryHandle& shm_handle,
          uint32_t size);
   virtual ~Buffer();
 
   // Resource overrides.
   virtual thunk::PPB_Buffer_API* AsPPB_Buffer_API() OVERRIDE;
 
@@ skipping 32 matching lines @@
   void OnMsgCreate(PP_Instance instance,
                    uint32_t size,
                    HostResource* result_resource,
                    ppapi::proxy::SerializedHandle* result_shm_handle);
 };
 
 }  // namespace proxy
 }  // namespace ppapi
 
 #endif  // PPAPI_PROXY_PPB_BUFFER_PROXY_H_