Use a RefPtr to store implementation in QualifiedName

Source/core/dom/QualifiedName.cpp

 /*
  * Copyright (C) 2005, 2006, 2009 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
  * version 2 of the License, or (at your option) any later version.
  *
  * This library is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
@@ skipping 59 matching lines @@
     static void translate(QualifiedName::QualifiedNameImpl*& location, const QualifiedNameComponents& components, unsigned)
     {
         location = QualifiedName::QualifiedNameImpl::create(AtomicString(components.m_prefix), AtomicString(components.m_localName), AtomicString(components.m_namespace)).leakRef();
     }
 };
 
 QualifiedName::QualifiedName(const AtomicString& p, const AtomicString& l, const AtomicString& n)
 {
     QualifiedNameComponents components = { p.impl(), l.impl(), n.isEmpty() ? nullAtom.impl() : n.impl() };
     QualifiedNameCache::AddResult addResult = qualifiedNameCache().add<QNameComponentsTranslator>(components);
-    m_impl = *addResult.iterator;
-    if (!addResult.isNewEntry)
-        m_impl->ref();
+    m_impl = addResult.isNewEntry ? adoptRef(*addResult.iterator) : *addResult.iterator;
 }
 
 QualifiedName::~QualifiedName()
 {
-    deref();
-}
-
-void QualifiedName::deref()
-{
-#ifdef QNAME_DEFAULT_CONSTRUCTOR
-    if (!m_impl)
-        return;
-#endif
-    ASSERT(!isHashTableDeletedValue());
-    m_impl->deref();
 }
 
 QualifiedName::QualifiedNameImpl::~QualifiedNameImpl()
 {
     qualifiedNameCache().remove(this);
 }
 
 String QualifiedName::toString() const
 {
     String local = localName();
@@ skipping 34 matching lines @@
 {
     new (targetAddress) QualifiedName(nullAtom, AtomicString(name), nameNamespace);
 }
 
 void createQualifiedName(void* targetAddress, StringImpl* name)
 {
     new (targetAddress) QualifiedName(nullAtom, AtomicString(name), nullAtom);
 }
 
 }