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

ipc/ipc_channel_proxy.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_PROXY_H_
 #define IPC_IPC_CHANNEL_PROXY_H_
 
 #include <vector>
 
 #include "base/memory/ref_counted.h"
@@ skipping 104 matching lines @@
   // Called to clear the pointer to the IPC task runner when it's going away.
   void ClearIPCTaskRunner();
 
   // Get the process ID for the connected peer.
   // Returns base::kNullProcessId if the peer is not connected yet.
   base::ProcessId GetPeerPID() const { return context_->peer_pid_; }
 
 #if defined(OS_POSIX) && !defined(OS_NACL)
   // Calls through to the underlying channel's methods.
   int GetClientFileDescriptor();
-  int TakeClientFileDescriptor();
+  base::ScopedFD TakeClientFileDescriptor();
 #endif  // defined(OS_POSIX)
 
  protected:
   class Context;
   // A subclass uses this constructor if it needs to add more information
   // to the internal state.
   ChannelProxy(Context* context);
 
   ChannelProxy(
       Listener* listener,
@@ skipping 96 matching lines @@
   // that involves this data.
   scoped_refptr<Context> context_;
 
   // Whether the channel has been initialized.
   bool did_init_;
 };
 
 }  // namespace IPC
 
 #endif  // IPC_IPC_CHANNEL_PROXY_H_