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

ppapi/proxy/ppb_audio_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_AUDIO_PROXY_H_
 #define PPAPI_PROXY_PPB_AUDIO_PROXY_H_
 
 #include <utility>
 
 #include "base/basictypes.h"
 #include "base/shared_memory.h"
 #include "base/sync_socket.h"
 #include "ipc/ipc_platform_file.h"
 #include "ppapi/c/pp_instance.h"
 #include "ppapi/c/pp_resource.h"
 #include "ppapi/c/ppb_audio.h"
 #include "ppapi/c/ppb_audio_config.h"
 #include "ppapi/proxy/interface_proxy.h"
 #include "ppapi/proxy/proxy_completion_callback_factory.h"
-#include "ppapi/proxy/serialized_structs.h"
 #include "ppapi/utility/completion_callback_factory.h"
 
 namespace ppapi {
 
 class HostResource;
 
 namespace proxy {
 
+class SerializedHandle;
+
 class PPB_Audio_Proxy : public InterfaceProxy {
  public:
   PPB_Audio_Proxy(Dispatcher* dispatcher);
   virtual ~PPB_Audio_Proxy();
 
   // Creates an Audio object in the plugin process.
   static PP_Resource CreateProxyResource(PP_Instance instance_id,
                                          PP_Resource config_id,
                                          PPB_Audio_Callback audio_callback,
                                          void* user_data);
@@ skipping 38 matching lines @@
 
   ProxyCompletionCallbackFactory<PPB_Audio_Proxy> callback_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(PPB_Audio_Proxy);
 };
 
 }  // namespace proxy
 }  // namespace ppapi
 
 #endif  // PPAPI_PROXY_PPB_AUDIO_PROXY_H_