Convert the PluginResource to be refcounted.

ppapi/proxy/ppb_pdf_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_pdf_proxy.h"
 
 #include <string.h>  // For memcpy.
 
 #include <map>
 
@@ skipping 57 matching lines @@
 
   SerializedFontDescription desc;
   desc.SetFromPPFontDescription(dispatcher, *description, true);
 
   HostResource result;
   dispatcher->Send(new PpapiHostMsg_PPBPDF_GetFontFileWithFallback(
       INTERFACE_ID_PPB_PDF, instance, desc, charset, &result));
   if (result.is_null())
     return 0;
 
-  linked_ptr<PrivateFontFile> object(new PrivateFontFile(result));
-  return PluginResourceTracker::GetInstance()->AddResource(object);
+  return PluginResourceTracker::GetInstance()->AddResource(
+      new PrivateFontFile(result));
 }
 
 bool GetFontTableForPrivateFontFile(PP_Resource font_file,
                                     uint32_t table,
                                     void* output,
                                     uint32_t* output_length) {
   PrivateFontFile* object = PluginResource::GetAs<PrivateFontFile>(font_file);
   if (!object)
     return false;
   PluginDispatcher* dispatcher = PluginDispatcher::GetForInstance(
@@ skipping 87 matching lines @@
           font_file.host_resource(), table, NULL, &table_length))
     return;
 
   result->resize(table_length);
   ppb_pdf_target()->GetFontTableForPrivateFontFile(font_file.host_resource(),
       table, const_cast<char*>(result->c_str()), &table_length);
 }
 
 }  // namespace proxy
 }  // namespace pp