Refactoring: Make IPC::Channel::TakeClientFileDescriptor() a ScopedFD.

base/file_descriptor_posix.h

 // Copyright (c) 2006-2009 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 BASE_FILE_DESCRIPTOR_POSIX_H_
 #define BASE_FILE_DESCRIPTOR_POSIX_H_
 
 #include "base/files/file.h"
+#include "base/files/scoped_file.h"
 
 namespace base {
 
 // -----------------------------------------------------------------------------
 // We introduct a special structure for file descriptors in order that we are
 // able to use template specialisation to special-case their handling.
 //
 // WARNING: (Chromium only) There are subtleties to consider if serialising
 // these objects over IPC. See comments in ipc/ipc_message_utils.h
 // above the template specialisation for this structure.
 // -----------------------------------------------------------------------------
 struct FileDescriptor {
   FileDescriptor() : fd(-1), auto_close(false) {}
 
   FileDescriptor(int ifd, bool iauto_close) : fd(ifd), auto_close(iauto_close) {
   }
 
   FileDescriptor(File file) : fd(file.TakePlatformFile()), auto_close(true) {}
+  explicit FileDescriptor(ScopedFD fd) : fd(fd.release()), auto_close(true) {}
 
   bool operator==(const FileDescriptor& other) const {
     return (fd == other.fd && auto_close == other.auto_close);
   }
 
   bool operator!=(const FileDescriptor& other) const {
     return !operator==(other);
   }
 
   // A comparison operator so that we can use these as keys in a std::map.
   bool operator<(const FileDescriptor& other) const {
     return other.fd < fd;
   }
 
   int fd;
   // If true, this file descriptor should be closed after it has been used. For
   // example an IPC system might interpret this flag as indicating that the
   // file descriptor it has been given should be closed after use.
   bool auto_close;
 };
 
 }  // namespace base
 
 #endif  // BASE_FILE_DESCRIPTOR_POSIX_H_