InlinedVisitor: Migrate xml to use inlined tracing

Source/core/xml/XPathStep.cpp

 /*
  * Copyright (C) 2005 Frerich Raabe <raabe@kde.org>
  * Copyright (C) 2006, 2009 Apple Inc. All rights reserved.
  * Copyright (C) 2007 Alexey Proskuryakov <ap@webkit.org>
  *
  * 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
@@ skipping 38 matching lines @@
     : m_axis(axis)
     , m_nodeTest(adoptPtrWillBeNoop(new NodeTest(nodeTest)))
 {
     m_predicates.swap(predicates);
 }
 
 Step::~Step()
 {
 }
 
-void Step::trace(Visitor* visitor)
+DEFINE_TRACE(Step)
 {
     visitor->trace(m_nodeTest);
     visitor->trace(m_predicates);
     ParseNode::trace(visitor);
 }
 
 void Step::optimize()
 {
     // Evaluate predicates as part of node test if possible to avoid building
     // unnecessary NodeSets.
@@ skipping 360 matching lines @@
         nodes.markSorted(false);
         return;
     }
     }
     ASSERT_NOT_REACHED();
 }
 
 }
 
 }