POSIX: Rewrite IPC's interaction with FileDescriptor

chrome/browser/renderer_host/render_widget_helper.h

 // Copyright (c) 2006-2008 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 CHROME_BROWSER_RENDEDER_HOST_RENDER_WIDGET_HELPER_H_
 #define CHROME_BROWSER_RENDEDER_HOST_RENDER_WIDGET_HELPER_H_
 
 #include "base/atomic_sequence_num.h"
 #include "base/hash_tables.h"
 #include "base/process.h"
 #include "base/ref_counted.h"
 #include "base/lock.h"
 #include "base/waitable_event.h"
-#include "chrome/common/ipc_maybe.h"
 #include "chrome/common/modal_dialog_event.h"
 #include "chrome/common/transport_dib.h"
 
 namespace IPC {
 class Message;
 }
 
 namespace base {
 class TimeDelta;
 }
@@ skipping 99 matching lines @@
 
   void CreateNewWindow(int opener_id,
                        bool user_gesture,
                        base::ProcessHandle render_process,
                        int* route_id,
                        ModalDialogEvent* modal_dialog_event);
   void CreateNewWidget(int opener_id, bool activatable, int* route_id);
 
 #if defined(OS_MACOSX)
   // Called on the IO thread to handle the allocation of a transport DIB
-  void AllocTransportDIB(size_t size, IPC::Maybe<TransportDIB::Handle>* result);
+  void AllocTransportDIB(size_t size, TransportDIB::Handle* result);
 
   // Called on the IO thread to handle the freeing of a transport DIB
   void FreeTransportDIB(TransportDIB::Id dib_id);
 #endif
 
  private:
   // A class used to proxy a paint message.  PaintMsgProxy objects are created
   // on the IO thread and destroyed on the UI thread.
   class PaintMsgProxy;
   friend class PaintMsgProxy;
@@ skipping 44 matching lines @@
   // The next routing id to use.
   base::AtomicSequenceNumber next_routing_id_;
 
   // Whether popup blocking is enabled or not.
   bool block_popups_;
 
   DISALLOW_COPY_AND_ASSIGN(RenderWidgetHelper);
 };
 
 #endif  // CHROME_BROWSER_RENDEDER_HOST_RENDER_WIDGET_HELPER_H_