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

ppapi/proxy/ppb_graphics_3d_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_GRAPHICS_3D_PROXY_H_
 #define PPAPI_PROXY_PPB_GRAPHICS_3D_PROXY_H_
 
 #include <vector>
 
 #include "base/shared_memory.h"
 #include "gpu/command_buffer/common/command_buffer.h"
 #include "ppapi/c/pp_graphics_3d.h"
 #include "ppapi/c/pp_instance.h"
 #include "ppapi/proxy/interface_proxy.h"
 #include "ppapi/proxy/proxy_completion_callback_factory.h"
-#include "ppapi/proxy/serialized_structs.h"
 #include "ppapi/shared_impl/ppb_graphics_3d_shared.h"
 #include "ppapi/shared_impl/resource.h"
 #include "ppapi/utility/completion_callback_factory.h"
 
 namespace ppapi {
 
 class HostResource;
 
 namespace proxy {
 
+class SerializedHandle;
+
 class Graphics3D : public PPB_Graphics3D_Shared {
  public:
   explicit Graphics3D(const HostResource& resource);
   virtual ~Graphics3D();
 
   bool Init(gpu::gles2::GLES2Implementation* share_gles2);
 
   // Graphics3DTrusted API. These are not implemented in the proxy.
   virtual PP_Bool InitCommandBuffer() OVERRIDE;
   virtual PP_Bool SetGetBuffer(int32_t shm_id) OVERRIDE;
@@ skipping 77 matching lines @@
   ProxyCompletionCallbackFactory<PPB_Graphics3D_Proxy> callback_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(PPB_Graphics3D_Proxy);
 };
 
 }  // namespace proxy
 }  // namespace ppapi
 
 #endif  // PPAPI_PROXY_PPB_GRAPHICS_3D_PROXY_H_