Introduce NaClFileInfoAutoCloser as an RAII wrapper.

ppapi/native_client/src/trusted/plugin/plugin.h

 // -*- c++ -*-
 // Copyright (c) 2012 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.
 
 // The portable representation of an instance and root scriptable object.
 // The PPAPI version of the plugin instantiates a subclass of this class.
 
 #ifndef NATIVE_CLIENT_SRC_TRUSTED_PLUGIN_PLUGIN_H_
 #define NATIVE_CLIENT_SRC_TRUSTED_PLUGIN_PLUGIN_H_
@@ skipping 437 matching lines @@
   // it and replay it to nexe after it's loaded. We need to replay when this
   // URLLoader resource is non-is_null().
   pp::URLLoader document_load_to_replay_;
 
   nacl::string mime_type_;
 
   // Keep track of the FileDownloaders created to fetch urls.
   std::set<FileDownloader*> url_downloaders_;
   // Keep track of file descriptors opened by StreamAsFile().
   // These are owned by the browser.
-  std::map<nacl::string, struct NaClFileInfo> url_file_info_map_;
+  std::map<nacl::string, struct NaClFileInfoAutoCloser*> url_file_info_map_;
 
   // Pending progress events.
   std::queue<ProgressEvent*> progress_events_;
 
   // Used for NexeFileDidOpenContinuation
   int64_t load_start_;
 
   int64_t init_time_;
   int64_t ready_time_;
   size_t nexe_size_;
@@ skipping 15 matching lines @@
   int64_t time_of_last_progress_event_;
   int exit_status_;
 
   const PPB_NaCl_Private* nacl_interface_;
   pp::UMAPrivate uma_interface_;
 };
 
 }  // namespace plugin
 
 #endif  // NATIVE_CLIENT_SRC_TRUSTED_PLUGIN_PLUGIN_H_