[PPAPI] ResourceVar now reference counts its PP_Resource in the plugin.

ppapi/shared_impl/resource_var.cc

 // Copyright 2013 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.
 
 #include "ppapi/shared_impl/resource_var.h"
 
 #include "ppapi/shared_impl/ppapi_globals.h"
 #include "ppapi/shared_impl/var_tracker.h"
 
 namespace ppapi {
 
-ResourceVar::ResourceVar() : pp_resource_(0) {}
-
-ResourceVar::ResourceVar(PP_Resource pp_resource) : pp_resource_(pp_resource) {}
-
-ResourceVar::ResourceVar(const IPC::Message& creation_message)
-    : pp_resource_(0),
-      creation_message_(creation_message) {}
-
-ResourceVar::~ResourceVar() {}
-
-bool ResourceVar::IsPending() const {
-  return pp_resource_ == 0 && creation_message_.type() != 0;
+const IPC::Message* ResourceVar::GetCreationMessage() const {
+  return NULL;
 }
 
 ResourceVar* ResourceVar::AsResourceVar() {
   return this;
 }
 
 PP_VarType ResourceVar::GetType() const {
   return PP_VARTYPE_RESOURCE;
 }
 
 // static
 ResourceVar* ResourceVar::FromPPVar(PP_Var var) {
   if (var.type != PP_VARTYPE_RESOURCE)
     return NULL;
   scoped_refptr<Var> var_object(
       PpapiGlobals::Get()->GetVarTracker()->GetVar(var));
   if (!var_object.get())
     return NULL;
   return var_object->AsResourceVar();
 }
 
+ResourceVar::ResourceVar() {}
+
+ResourceVar::~ResourceVar() {}
+
 }  // namespace ppapi