InlinedVisitor: Migrate dom to use inlined tracing

Source/core/dom/Position.h

 /*
  * Copyright (C) 2004, 2006, 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 184 matching lines @@
     static ContainerNode* findParent(const Node*);
 
     void debugPosition(const char* msg = "") const;
 
 #ifndef NDEBUG
     void formatForDebugger(char* buffer, unsigned length) const;
     void showAnchorTypeAndOffset() const;
     void showTreeForThis() const;
 #endif
 
-    void trace(Visitor*);
+    DECLARE_TRACE();
 
 private:
     int offsetForPositionAfterAnchor() const;
 
     int renderedOffset() const;
 
     static AnchorType anchorTypeForLegacyEditingPosition(Node* anchorNode, int offset);
 
     RefPtrWillBeMember<Node> m_anchorNode;
     // m_offset can be the offset inside m_anchorNode, or if editingIgnoresContent(m_anchorNode)
@@ skipping 100 matching lines @@
 
 } // namespace blink
 
 #ifndef NDEBUG
 // Outside the WebCore namespace for ease of invocation from gdb.
 void showTree(const blink::Position&);
 void showTree(const blink::Position*);
 #endif
 
 #endif // Position_h