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

ipc/ipc_channel_posix.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_POSIX_H_
 #define IPC_IPC_CHANNEL_POSIX_H_
 
 #include "ipc/ipc_channel.h"
 
 #include <sys/socket.h>  // for CMSG macros
@@ skipping 47 matching lines @@
                Listener* listener);
   virtual ~ChannelPosix();
 
   // Channel implementation
   virtual bool Connect() override;
   virtual void Close() override;
   virtual bool Send(Message* message) override;
   virtual base::ProcessId GetPeerPID() const override;
   virtual base::ProcessId GetSelfPID() const override;
   virtual int GetClientFileDescriptor() const override;
-  virtual int TakeClientFileDescriptor() override;
+  virtual base::ScopedFD TakeClientFileDescriptor() override;
 
   // Returns true if the channel supports listening for connections.
   bool AcceptsConnections() const;
 
   // Returns true if the channel supports listening for connections and is
   // currently connected.
   bool HasAcceptedConnection() const;
 
   // Closes any currently connected socket, and returns to a listening state
   // for more connections.
@@ skipping 139 matching lines @@
   // If non-zero, overrides the process ID sent in the hello message.
   static int global_pid_;
 #endif  // OS_LINUX
 
   DISALLOW_IMPLICIT_CONSTRUCTORS(ChannelPosix);
 };
 
 }  // namespace IPC
 
 #endif  // IPC_IPC_CHANNEL_POSIX_H_