InlinedVisitor: Migrate dom to use inlined tracing

Source/core/dom/MessagePort.cpp

 /*
  * Copyright (C) 2008 Apple Inc. All Rights Reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 242 matching lines @@
 
     OwnPtrWillBeRawPtr<MessagePortArray> portArray = adoptPtrWillBeNoop(new MessagePortArray(channels->size()));
     for (unsigned i = 0; i < channels->size(); ++i) {
         RefPtrWillBeRawPtr<MessagePort> port = MessagePort::create(context);
         port->entangle((*channels)[i].release());
         (*portArray)[i] = port.release();
     }
     return portArray.release();
 }
 
-void MessagePort::trace(Visitor* visitor)
+DEFINE_TRACE(MessagePort)
 {
     ActiveDOMObject::trace(visitor);
     EventTargetWithInlineData::trace(visitor);
 }
 
 } // namespace blink