Have TreeScrope::adoptIfNeeded() take a reference instead of a pointer

Source/core/dom/TreeScope.h

 /*
  * Copyright (C) 2011 Google Inc. All Rights Reserved.
  * Copyright (C) 2012 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
@@ skipping 72 matching lines @@
     // Find first anchor with the given name.
     // First searches for an element with the given ID, but if that fails, then looks
     // for an anchor with the given name. ID matching is always case sensitive, but
     // Anchor name matching is case sensitive in strict mode and not case sensitive in
     // quirks mode for historical compatibility reasons.
     Element* findAnchor(const String& name);
 
     bool applyAuthorStyles() const;
 
     // Used by the basic DOM mutation methods (e.g., appendChild()).
-    void adoptIfNeeded(Node*);
+    void adoptIfNeeded(Node&);
 
     Node* rootNode() const { return m_rootNode; }
 
     IdTargetObserverRegistry& idTargetObserverRegistry() const { return *m_idTargetObserverRegistry.get(); }
 
     static TreeScope* noDocumentInstance()
     {
         DEFINE_STATIC_LOCAL(TreeScope, instance, ());
         return &instance;
     }
@@ skipping 89 matching lines @@
 inline bool operator!=(const TreeScope& a, const TreeScope& b) { return !(a == b); }
 inline bool operator!=(const TreeScope& a, const TreeScope* b) { return !(a == b); }
 inline bool operator!=(const TreeScope* a, const TreeScope& b) { return !(a == b); }
 
 RenderObject* rendererFromPoint(Document*, int x, int y, LayoutPoint* localPoint = 0);
 TreeScope* commonTreeScope(Node*, Node*);
 
 } // namespace WebCore
 
 #endif // TreeScope_h