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

ipc/mojo/ipc_channel_mojo.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_channel_mojo.h"
 
 #include "base/bind.h"
 #include "base/bind_helpers.h"
 #include "base/lazy_instance.h"
 #include "ipc/ipc_listener.h"
@@ skipping 195 matching lines @@
   listener_->OnMessageReceived(message);
   if (message.dispatch_error())
     listener_->OnBadMessageReceived(message);
 }
 
 #if defined(OS_POSIX) && !defined(OS_NACL)
 int ChannelMojo::GetClientFileDescriptor() const {
   return bootstrap_->GetClientFileDescriptor();
 }
 
-int ChannelMojo::TakeClientFileDescriptor() {
+base::ScopedFD ChannelMojo::TakeClientFileDescriptor() {
   return bootstrap_->TakeClientFileDescriptor();
 }
 
 // static
 MojoResult ChannelMojo::WriteToFileDescriptorSet(
     const std::vector<MojoHandle>& handle_buffer,
     Message* message) {
   for (size_t i = 0; i < handle_buffer.size(); ++i) {
     mojo::embedder::ScopedPlatformHandle platform_handle;
     MojoResult unwrap_result = mojo::embedder::PassWrappedPlatformHandle(
@@ skipping 48 matching lines @@
 
     fdset->CommitAll();
   }
 
   return MOJO_RESULT_OK;
 }
 
 #endif  // defined(OS_POSIX) && !defined(OS_NACL)
 
 }  // namespace IPC