Remove some PlatformFile uses from NaCl.

ipc/ipc_platform_file.h

 // 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.
 
 #ifndef IPC_IPC_PLATFORM_FILE_H_
 #define IPC_IPC_PLATFORM_FILE_H_
 
 #include "base/basictypes.h"
 #include "base/files/file.h"
 #include "base/platform_file.h"
@@ skipping 28 matching lines @@
   return transit.fd;
 #endif
 }
 
 // Returns a file handle equivalent to |file| that can be used in |process|.
 IPC_EXPORT PlatformFileForTransit GetFileHandleForProcess(
     base::PlatformFile file,
     base::ProcessHandle process,
     bool close_source_handle);
 
+// Returns a file handle equivalent to |file| that can be used in |process|.
+// Note that this function takes ownership of |file|.
+IPC_EXPORT PlatformFileForTransit TakeFileHandleForProcess(
+    base::File file,
+    base::ProcessHandle process);
+
 }  // namespace IPC
 
 #endif  // IPC_IPC_PLATFORM_FILE_H_