ipc: Make a new class PlaceholderBrokerableAttachment.

ipc/handle_attachment_win.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/handle_attachment_win.h"
 
 #include <windows.h>
 
 namespace IPC {
 namespace internal {
 
 HandleAttachmentWin::HandleAttachmentWin(const HANDLE& handle,
                                          HandleWin::Permissions permissions)
     : handle_(handle), permissions_(permissions) {}
 
 HandleAttachmentWin::HandleAttachmentWin(const WireFormat& wire_format)
-    : BrokerableAttachment(wire_format.attachment_id, false),
+    : BrokerableAttachment(wire_format.attachment_id),
       handle_(LongToHandle(wire_format.handle)),
       permissions_(wire_format.permissions) {}
 
 HandleAttachmentWin::HandleAttachmentWin(
     const BrokerableAttachment::AttachmentId& id)
-    : BrokerableAttachment(id, true),
+    : BrokerableAttachment(id),
       handle_(INVALID_HANDLE_VALUE),
       permissions_(HandleWin::INVALID) {}
 
 HandleAttachmentWin::~HandleAttachmentWin() {
 }
 
 HandleAttachmentWin::BrokerableType HandleAttachmentWin::GetBrokerableType()
     const {
   return WIN_HANDLE;
 }
 
-void HandleAttachmentWin::PopulateWithAttachment(
-    const BrokerableAttachment* attachment) {
-  DCHECK(NeedsBrokering());
-  DCHECK(!attachment->NeedsBrokering());
-  DCHECK(GetIdentifier() == attachment->GetIdentifier());
-  DCHECK_EQ(GetBrokerableType(), attachment->GetBrokerableType());
-
-  const HandleAttachmentWin* handle_attachment =
-      static_cast<const HandleAttachmentWin*>(attachment);
-  handle_ = handle_attachment->handle_;
-  SetNeedsBrokering(false);
-}
-
 HandleAttachmentWin::WireFormat HandleAttachmentWin::GetWireFormat(
     const base::ProcessId& destination) const {
   WireFormat format;
   format.handle = HandleToLong(handle_);
   format.attachment_id = GetIdentifier();
   format.destination_process = destination;
   format.permissions = permissions_;
   return format;
 }
 
 }  // namespace internal
 }  // namespace IPC