WIP (Introduce WTF::NonNullPtr<T>.)

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 106 matching lines @@
         ASSERT(!deletionHasBegun());
         --m_guardRefCount;
         if (!m_guardRefCount && !refCount() && this != noDocumentInstance() && !rootNodeHasTreeSharedParent()) {
             beginDeletion();
             delete this;
         }
     }
 
     void removedLastRefToScope();
 
-    bool isInclusiveAncestorOf(const TreeScope&) const;
-    unsigned short comparePosition(const TreeScope&) const;
+    bool isInclusiveAncestorOf(NonNullPtr<const TreeScope>) const;
+    unsigned short comparePosition(NonNullPtr<const TreeScope>) const;
 
     Element* getElementByAccessKey(const String& key) const;
 
 protected:
     TreeScope(ContainerNode*, Document*);
     TreeScope(Document*);
     virtual ~TreeScope();
 
     void destroyTreeScopeData();
     void clearDocumentScope();
@@ skipping 46 matching lines @@
 {
     return m_elementsById && m_elementsById->containsMultiple(id.impl());
 }
 
 Node* nodeFromPoint(Document*, int x, int y, LayoutPoint* localPoint = 0);
 TreeScope* commonTreeScope(Node*, Node*);
 
 } // namespace WebCore
 
 #endif // TreeScope_h