Delete IPC::ChannelPosix, IPC::ChannelWin and IPC::AttachmentBroker.

ipc/attachment_broker_unprivileged_mac.h

-// Copyright 2015 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_ATTACHMENT_BROKER_UNPRIVILEGED_MAC_H_
-#define IPC_ATTACHMENT_BROKER_UNPRIVILEGED_MAC_H_
-
-#include "base/macros.h"
-#include "ipc/attachment_broker_unprivileged.h"
-#include "ipc/ipc_export.h"
-#include "ipc/mach_port_attachment_mac.h"
-
-namespace IPC {
-
-class BrokerableAttachment;
-
-// This class is an implementation of AttachmentBroker for the OSX platform
-// for non-privileged processes.
-class IPC_EXPORT AttachmentBrokerUnprivilegedMac
-    : public IPC::AttachmentBrokerUnprivileged {
- public:
-  AttachmentBrokerUnprivilegedMac();
-  ~AttachmentBrokerUnprivilegedMac() override;
-
-  // IPC::AttachmentBroker overrides.
-  bool SendAttachmentToProcess(
-      const scoped_refptr<IPC::BrokerableAttachment>& attachment,
-      base::ProcessId destination_process) override;
-
-  // IPC::Listener overrides.
-  bool OnMessageReceived(const Message& message) override;
-
- private:
-  // IPC message handlers.
-  void OnMachPortHasBeenDuplicated(
-      const IPC::internal::MachPortAttachmentMac::WireFormat& wire_format);
-
-  DISALLOW_COPY_AND_ASSIGN(AttachmentBrokerUnprivilegedMac);
-};
-
-}  // namespace IPC
-
-#endif  // IPC_ATTACHMENT_BROKER_UNPRIVILEGED_MAC_H_