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

ipc/mojo/ipc_mojo_bootstrap.cc

 // Copyright 2014 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.
 
 #include "ipc/mojo/ipc_mojo_bootstrap.h"
 
 #include "base/logging.h"
 #include "base/process/process_handle.h"
 #include "ipc/ipc_message_utils.h"
 #include "ipc/ipc_platform_file.h"
@@ skipping 193 matching lines @@
 
 bool MojoBootstrap::Send(Message* message) {
   return channel_->Send(message);
 }
 
 #if defined(OS_POSIX) && !defined(OS_NACL)
 int MojoBootstrap::GetClientFileDescriptor() const {
   return channel_->GetClientFileDescriptor();
 }
 
-int MojoBootstrap::TakeClientFileDescriptor() {
+base::ScopedFD MojoBootstrap::TakeClientFileDescriptor() {
   return channel_->TakeClientFileDescriptor();
 }
 #endif  // defined(OS_POSIX) && !defined(OS_NACL)
 
 }  // namespace IPC