Revert of IPC: Add attachment brokering support to the message header.

ipc/handle_attachment_win.cc

Index: ipc/handle_attachment_win.cc
diff --git a/ipc/handle_attachment_win.cc b/ipc/handle_attachment_win.cc
index b7f43734b5bc7500af56629432ed5ae3da547aec..50e3e6dab24310c5bba54d5f44cfa42cb436630e 100644
--- a/ipc/handle_attachment_win.cc
+++ b/ipc/handle_attachment_win.cc
@@ -14,13 +14,13 @@
     : handle_(handle), permissions_(permissions) {}
 
 HandleAttachmentWin::HandleAttachmentWin(const WireFormat& wire_format)
-    : BrokerableAttachment(wire_format.attachment_id),
+    : BrokerableAttachment(wire_format.attachment_id, false),
       handle_(LongToHandle(wire_format.handle)),
       permissions_(wire_format.permissions) {}
 
 HandleAttachmentWin::HandleAttachmentWin(
     const BrokerableAttachment::AttachmentId& id)
-    : BrokerableAttachment(id),
+    : BrokerableAttachment(id, true),
       handle_(INVALID_HANDLE_VALUE),
       permissions_(HandleWin::INVALID) {}
 
@@ -30,6 +30,19 @@
 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(