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

Source/core/dom/Attr.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2001 Peter Kelly (pmk@post.com)
  *           (C) 2001 Dirk Mueller (mueller@kde.org)
  * Copyright (C) 2004, 2005, 2006, 2007, 2009, 2010, 2012 Apple Inc. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
@@ skipping 67 matching lines @@
 
 void Attr::createTextChild()
 {
     ASSERT(refCount());
     if (!value().isEmpty()) {
         RefPtr<Text> textNode = document().createTextNode(value().string());
 
         // This does everything appendChild() would do in this situation (assuming m_ignoreChildrenChanged was set),
         // but much more efficiently.
         textNode->setParentOrShadowHostNode(this);
-        treeScope().adoptIfNeeded(textNode.get());
+        treeScope()->adoptIfNeeded(textNode.get());
         setFirstChild(textNode.get());
         setLastChild(textNode.get());
     }
 }
 
 void Attr::setPrefix(const AtomicString& prefix, ExceptionState& es)
 {
     checkSetPrefix(prefix, es);
     if (es.hadException())
         return;
@@ skipping 109 matching lines @@
 }
 
 void Attr::attachToElement(Element* element)
 {
     ASSERT(!m_element);
     m_element = element;
     m_standaloneValue = nullAtom;
 }
 
 }