InlinedVisitor: Migrate dom to use inlined tracing

Source/core/dom/custom/CustomElementCallbackQueue.cpp

 /*
  * Copyright (C) 2013 Google 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
@@ skipping 54 matching lines @@
     if (owner() == caller && m_index == m_queue.size()) {
         // This processInQueue exhausted the queue; shrink it.
         m_index = 0;
         m_queue.resize(0);
         m_owner = -1;
     }
 
     return didWork;
 }
 
-void CustomElementCallbackQueue::trace(Visitor* visitor)
+DEFINE_TRACE(CustomElementCallbackQueue)
 {
     visitor->trace(m_element);
     visitor->trace(m_queue);
 }
 
 } // namespace blink