Move host resource from the proxy to the shared_impl.

ppapi/proxy/ppb_audio_config_proxy.h

 // Copyright (c) 2010 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_CONFIG_PROXY_H_
 #define PPAPI_PROXY_PPB_AUDIO_CONFIG_PROXY_H_
 
 #include "base/basictypes.h"
 #include "ppapi/c/pp_instance.h"
 #include "ppapi/c/pp_resource.h"
 #include "ppapi/c/ppb_audio_config.h"
 #include "ppapi/proxy/interface_proxy.h"
 
 struct PPB_AudioConfig;
 
 namespace pp {
 namespace proxy {
 
-class HostResource;
-
 class PPB_AudioConfig_Proxy : public InterfaceProxy {
  public:
   PPB_AudioConfig_Proxy(Dispatcher* dispatcher, const void* target_interface);
   virtual ~PPB_AudioConfig_Proxy();
 
   static const Info* GetInfo();
 
   static PP_Resource CreateProxyResource(PP_Instance instance,
                                          PP_AudioSampleRate sample_rate,
                                          uint32_t sample_frame_count);
 
   // InterfaceProxy implementation.
   virtual bool OnMessageReceived(const IPC::Message& msg);
 
  private:
   DISALLOW_COPY_AND_ASSIGN(PPB_AudioConfig_Proxy);
 };
 
 }  // namespace proxy
 }  // namespace pp
 
 #endif  // PPAPI_PROXY_PPB_AUDIO_CONFIG_PROXY_H_