Cleanup: Get rid of OS_WIN/OS_POSIX ifdefs from MojoApplication

content/child/mojo/mojo_application.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 "content/child/mojo/mojo_application.h"
 
 #include "content/child/child_process.h"
 #include "content/common/mojo/mojo_messages.h"
 #include "ipc/ipc_message.h"
 
 namespace content {
 
 MojoApplication::MojoApplication() {
 }
 
 MojoApplication::~MojoApplication() {
 }
 
 bool MojoApplication::OnMessageReceived(const IPC::Message& msg) {
   bool handled = true;
   IPC_BEGIN_MESSAGE_MAP(MojoApplication, msg)
     IPC_MESSAGE_HANDLER(MojoMsg_Activate, OnActivate)
     IPC_MESSAGE_UNHANDLED(handled = false)
   IPC_END_MESSAGE_MAP()
   return handled;
 }
 
 void MojoApplication::OnActivate(
     const IPC::PlatformFileForTransit& file) {
-#if defined(OS_POSIX)
-  base::PlatformFile handle = file.fd;
-#elif defined(OS_WIN)
-  base::PlatformFile handle = file;
-#endif
+  base::PlatformFile handle = IPC::PlatformFileForTransitToPlatformFile(file);
   mojo::ScopedMessagePipeHandle message_pipe =
       channel_init_.Init(handle,
                          ChildProcess::current()->io_message_loop_proxy());
   DCHECK(message_pipe.is_valid());
   service_registry_.BindRemoteServiceProvider(message_pipe.Pass());
 }
 
 }  // namespace content