Remove some PlatformFile uses from NaCl.

ipc/ipc_platform_file.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 "ipc/ipc_platform_file.h"
 
 #if defined(OS_POSIX)
 #include <unistd.h>
 #endif
 
@@ skipping 27 matching lines @@
   // close the source handle before the message is sent, creating a race
   // condition.
   int fd = close_source_handle ? handle : ::dup(handle);
   out_handle = base::FileDescriptor(fd, true);
 #else
   #error Not implemented.
 #endif
   return out_handle;
 }
 
+PlatformFileForTransit TakeFileHandleForProcess(base::File file,
+                                                base::ProcessHandle process) {
+  return GetFileHandleForProcess(file.TakePlatformFile(), process, true);
+}
+
 }  // namespace IPC