Don't use a scoped_refptr for StringVar::FromPPVar

ppapi/proxy/ppb_var_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_proxy.h"
 
 #include "ppapi/c/pp_var.h"
 #include "ppapi/c/ppb_var.h"
 #include "ppapi/proxy/plugin_resource_tracker.h"
 #include "ppapi/proxy/plugin_var_tracker.h"
@@ skipping 12 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;
 }
 
 const PPB_Var var_interface = {
   &AddRefVar,
@@ skipping 30 matching lines @@
 }
 
 bool PPB_Var_Proxy::OnMessageReceived(const IPC::Message& msg) {
   // All PPB_Var calls are handled locally; there is no need to send or receive
   // messages here.
   return false;
 }
 
 }  // namespace proxy
 }  // namespace ppapi