Revert of Remove IPC::BrokerableAttachment.

ipc/mach_port_attachment_mac.cc

 // 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.
 
 #include "ipc/mach_port_attachment_mac.h"
 
 #include <stdint.h>
 
 #include "base/mac/mach_logging.h"
 
 namespace IPC {
 namespace internal {
 
 MachPortAttachmentMac::MachPortAttachmentMac(mach_port_t mach_port)
     : mach_port_(mach_port), owns_mach_port_(true) {
   if (mach_port != MACH_PORT_NULL) {
     kern_return_t kr = mach_port_mod_refs(mach_task_self(), mach_port,
                                           MACH_PORT_RIGHT_SEND, 1);
     MACH_LOG_IF(ERROR, kr != KERN_SUCCESS, kr)
         << "MachPortAttachmentMac mach_port_mod_refs";
   }
 }
 MachPortAttachmentMac::MachPortAttachmentMac(mach_port_t mach_port,
                                              FromWire from_wire)
     : mach_port_(mach_port), owns_mach_port_(true) {}
 
+MachPortAttachmentMac::MachPortAttachmentMac(const WireFormat& wire_format)
+    : mach_port_(static_cast<mach_port_t>(wire_format.mach_port)),
+      owns_mach_port_(true) {}
+
 MachPortAttachmentMac::~MachPortAttachmentMac() {
   if (mach_port_ != MACH_PORT_NULL && owns_mach_port_) {
     kern_return_t kr = mach_port_mod_refs(mach_task_self(), mach_port_,
                                           MACH_PORT_RIGHT_SEND, -1);
     MACH_LOG_IF(ERROR, kr != KERN_SUCCESS, kr)
         << "~MachPortAttachmentMac mach_port_mod_refs";
   }
 }
 
-MessageAttachment::Type MachPortAttachmentMac::GetType() const {
-  return Type::MACH_PORT;
+MachPortAttachmentMac::BrokerableType MachPortAttachmentMac::GetBrokerableType()
+    const {
+  return MACH_PORT;
+}
+
+MachPortAttachmentMac::WireFormat MachPortAttachmentMac::GetWireFormat(
+    const base::ProcessId& destination) const {
+  return WireFormat(static_cast<uint32_t>(mach_port_), destination);
 }
 
 }  // namespace internal
 }  // namespace IPC