Add C++ wrappers for output parameters.

ppapi/native_client/src/trusted/plugin/file_downloader.cc

 // 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.
 
 #include "native_client/src/trusted/plugin/file_downloader.h"
 
 #include <stdio.h>
 #include <string>
 
 #include "native_client/src/include/portability_io.h"
@@ skipping 104 matching lines @@
   if (streaming_to_file())
     start_notify = &FileDownloader::URLLoadStartNotify;
   else
     start_notify = &FileDownloader::URLBufferStartNotify;
 
   // Request asynchronous download of the url providing an on-load callback.
   // As long as this step is guaranteed to be asynchronous, we can call
   // synchronously all other internal callbacks that eventually result in the
   // invocation of the user callback. The user code will not be reentered.
   pp::CompletionCallback onload_callback =
-      callback_factory_.NewRequiredCallback(start_notify);
+      callback_factory_.NewCallback(start_notify);
   int32_t pp_error = url_loader_.Open(url_request, onload_callback);
   PLUGIN_PRINTF(("FileDownloader::Open (pp_error=%"NACL_PRId32")\n", pp_error));
   CHECK(pp_error == PP_OK_COMPLETIONPENDING);
   return true;
 }
 
 int32_t FileDownloader::GetPOSIXFileDescriptor() {
   if (!streaming_to_file()) {
     return NACL_NO_FILE_DESC;
   }
@@ skipping 197 matching lines @@
 
 bool FileDownloader::streaming_to_file() const {
   return (flags_ & DOWNLOAD_TO_BUFFER) == 0;
 }
 
 bool FileDownloader::streaming_to_buffer() const {
   return (flags_ & DOWNLOAD_TO_BUFFER) == 1;
 }
 
 }  // namespace plugin