Add a unified resource tracker shared between the proxy and the impl.

ppapi/proxy/ppb_flash_menu_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_FLASH_MENU_PROXY_H_
 #define PPAPI_PPB_FLASH_MENU_PROXY_H_
 
 #include "ppapi/proxy/interface_proxy.h"
-#include "ppapi/proxy/plugin_resource.h"
 #include "ppapi/proxy/proxy_non_thread_safe_ref_count.h"
 
 struct PP_Flash_Menu;
 struct PP_Point;
 struct PPB_Flash_Menu;
 
+namespace ppapi {
+class HostResource;
+}
+
 namespace pp {
 namespace proxy {
 
 class SerializedFlashMenu;
 
 class PPB_Flash_Menu_Proxy : public InterfaceProxy {
  public:
   PPB_Flash_Menu_Proxy(Dispatcher* dispatcher, const void* target_interface);
   virtual ~PPB_Flash_Menu_Proxy();
 
@@ skipping 19 matching lines @@
   void SendShowACKToPlugin(int32_t result, ShowRequest* request);
 
   CompletionCallbackFactory<PPB_Flash_Menu_Proxy,
                             ProxyNonThreadSafeRefCount> callback_factory_;
 };
 
 }  // namespace proxy
 }  // namespace pp
 
 #endif  // PPAPI_PPB_FLASH_MENU_PROXY_H_