Don't use a scoped_refptr for StringVar::FromPPVar

ppapi/proxy/ppb_var_deprecated_proxy.cc

 // 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.
 
 #include "ppapi/proxy/ppb_var_deprecated_proxy.h"
 
 #include <stdlib.h>  // For malloc
 
 #include "base/logging.h"
 #include "base/message_loop.h"
@@ skipping 52 matching lines @@
 
 void ReleaseVar(PP_Var var) {
   PluginResourceTracker::GetInstance()->var_tracker().ReleaseVar(var);
 }
 
 PP_Var VarFromUtf8(PP_Module module, const char* data, uint32_t len) {
   return StringVar::StringToPPVar(module, data, len);
 }
 
 const char* VarToUtf8(PP_Var var, uint32_t* len) {
-  scoped_refptr<StringVar> str(StringVar::FromPPVar(var));
+  StringVar* str = StringVar::FromPPVar(var);
   if (str) {
     *len = static_cast<uint32_t>(str->value().size());
     return str->value().c_str();
   }
   *len = 0;
   return NULL;
 }
 
 bool HasProperty(PP_Var var,
                  PP_Var name,
@@ skipping 430 matching lines @@
 
 void PPB_Var_Deprecated_Proxy::DoReleaseObject(int64 object_id) {
   PP_Var var;
   var.type = PP_VARTYPE_OBJECT;
   var.value.as_id = object_id;
   ppb_var_target()->Release(var);
 }
 
 }  // namespace proxy
 }  // namespace ppapi