Make a global enum to differentiate impl & proxy.

ppapi/shared_impl/ppb_device_ref_shared.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_SHARED_IMPL_PPB_DEVICE_REF_SHARED_H_
 #define PPAPI_SHARED_IMPL_PPB_DEVICE_REF_SHARED_H_
 
 #include <string>
 
 #include "base/basictypes.h"
@@ skipping 11 matching lines @@
 
   PP_DeviceType_Dev type;
   std::string name;
   std::string id;
 };
 
 class PPAPI_SHARED_EXPORT PPB_DeviceRef_Shared
     : public Resource,
       public thunk::PPB_DeviceRef_API {
  public:
-  struct InitAsImpl {};
-  struct InitAsProxy {};
-
-  // The dummy arguments control which version of Resource's constructor is
-  // called for this base class.
-  PPB_DeviceRef_Shared(const InitAsImpl&,
-                       PP_Instance instance,
-                       const DeviceRefData& data);
-  PPB_DeviceRef_Shared(const InitAsProxy&,
+  PPB_DeviceRef_Shared(ResourceObjectType type,
                        PP_Instance instance,
                        const DeviceRefData& data);
 
   // Resource overrides.
   virtual PPB_DeviceRef_API* AsPPB_DeviceRef_API() OVERRIDE;
 
   // PPB_DeviceRef_API implementation.
   virtual const DeviceRefData& GetDeviceRefData() const OVERRIDE;
   virtual PP_DeviceType_Dev GetType() OVERRIDE;
   virtual PP_Var GetName() OVERRIDE;
 
  private:
   DeviceRefData data_;
 
   DISALLOW_IMPLICIT_CONSTRUCTORS(PPB_DeviceRef_Shared);
 };
 
 }  // namespace ppapi
 
 #endif  // PPAPI_SHARED_IMPL_PPB_DEVICE_REF_SHARED_H_