Convert the PluginResource to be refcounted.

ppapi/proxy/ppb_url_loader_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_url_loader_proxy.h"
 
 #include <algorithm>
 #include <deque>
 #include <vector>
 
@@ skipping 339 matching lines @@
       callback_factory_(ALLOW_THIS_IN_INITIALIZER_LIST(this)),
       host_urlloader_trusted_interface_(NULL) {
 }
 
 PPB_URLLoader_Proxy::~PPB_URLLoader_Proxy() {
 }
 
 // static
 PP_Resource PPB_URLLoader_Proxy::TrackPluginResource(
     const HostResource& url_loader_resource) {
-  linked_ptr<URLLoader> object(new URLLoader(url_loader_resource));
-  return PluginResourceTracker::GetInstance()->AddResource(object);
+  return PluginResourceTracker::GetInstance()->AddResource(
+      new URLLoader(url_loader_resource));
 }
 
 // static
 const InterfaceProxy::Info* PPB_URLLoader_Proxy::GetInfo() {
   static const Info info = {
     ::ppapi::thunk::GetPPB_URLLoader_Thunk(),
     PPB_URLLOADER_INTERFACE,
     INTERFACE_ID_PPB_URL_LOADER,
     false,
     &CreateURLLoaderProxy,
@@ skipping 205 matching lines @@
   info->read_buffer.resize(bytes_read);
 
   dispatcher()->Send(new PpapiMsg_PPBURLLoader_ReadResponseBody_Ack(
       INTERFACE_ID_PPB_URL_LOADER, info->resource, result, info->read_buffer));
 
   delete info;
 }
 
 }  // namespace proxy
 }  // namespace pp