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

ipc/ipc_channel.h

 // 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.
 
 #ifndef IPC_IPC_CHANNEL_H_
 #define IPC_IPC_CHANNEL_H_
 
 #include <string>
 
 #if defined(OS_POSIX)
 #include <sys/types.h>
 #endif
 
 #include "base/compiler_specific.h"
+#include "base/files/scoped_file.h"
 #include "base/process/process.h"
 #include "ipc/ipc_channel_handle.h"
 #include "ipc/ipc_message.h"
 #include "ipc/ipc_sender.h"
 
 namespace IPC {
 
 class Listener;
 
 //------------------------------------------------------------------------------
@@ skipping 157 matching lines @@
 #if defined(OS_POSIX) && !defined(OS_NACL)
   // On POSIX an IPC::Channel wraps a socketpair(), this method returns the
   // FD # for the client end of the socket.
   // This method may only be called on the server side of a channel.
   // This method can be called on any thread.
   virtual int GetClientFileDescriptor() const = 0;
 
   // Same as GetClientFileDescriptor, but transfers the ownership of the
   // file descriptor to the caller.
   // This method can be called on any thread.
-  virtual int TakeClientFileDescriptor() = 0;
+  virtual base::ScopedFD TakeClientFileDescriptor() = 0;
 #endif  // defined(OS_POSIX) && !defined(OS_NACL)
 
   // Returns true if a named server channel is initialized on the given channel
   // ID. Even if true, the server may have already accepted a connection.
   static bool IsNamedServerInitialized(const std::string& channel_id);
 
 #if !defined(OS_NACL)
   // Generates a channel ID that's non-predictable and unique.
   static std::string GenerateUniqueRandomChannelID();
 
@@ skipping 23 matching lines @@
 
 #if defined(OS_POSIX)
 // SocketPair() creates a pair of socket FDs suitable for using with
 // IPC::Channel.
 IPC_EXPORT bool SocketPair(int* fd1, int* fd2);
 #endif
 
 }  // namespace IPC
 
 #endif  // IPC_IPC_CHANNEL_H_