ppapi: Cleanup class/struct forward declarations

ppapi/proxy/ppb_var_deprecated_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_PROXY_PPB_VAR_DEPRECATED_PROXY_H_
 #define PPAPI_PROXY_PPB_VAR_DEPRECATED_PROXY_H_
 
 #include <stdint.h>
 
 #include <vector>
 
 #include "base/macros.h"
 #include "base/memory/weak_ptr.h"
 #include "ppapi/c/pp_instance.h"
 #include "ppapi/proxy/interface_proxy.h"
 
 struct PPB_Var_Deprecated;
 
 namespace ppapi {
 namespace proxy {
 
-class SerializedVar;
 class SerializedVarReceiveInput;
 class SerializedVarVectorOutParam;
 class SerializedVarVectorReceiveInput;
 class SerializedVarOutParam;
 class SerializedVarReturnValue;
 
 class PPB_Var_Deprecated_Proxy : public InterfaceProxy {
  public:
   explicit PPB_Var_Deprecated_Proxy(Dispatcher* dispatcher);
   virtual ~PPB_Var_Deprecated_Proxy();
@@ skipping 64 matching lines @@
 
   base::WeakPtrFactory<PPB_Var_Deprecated_Proxy> task_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(PPB_Var_Deprecated_Proxy);
 };
 
 }  // namespace proxy
 }  // namespace ppapi
 
 #endif  // PPAPI_PROXY_PPB_VAR_DEPRECATED_PROXY_H_