Have EditCommand classes deal with Document references, not pointers

Source/core/editing/SetNodeAttributeCommand.cpp

 /*
  * Copyright (C) 2005, 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 15 matching lines @@
 #include "config.h"
 #include "core/editing/SetNodeAttributeCommand.h"
 
 #include "core/dom/Element.h"
 #include "wtf/Assertions.h"
 
 namespace WebCore {
 
 SetNodeAttributeCommand::SetNodeAttributeCommand(PassRefPtr<Element> element,
         const QualifiedName& attribute, const AtomicString& value)
-    : SimpleEditCommand(&element->document())
+    : SimpleEditCommand(element->document())
     , m_element(element)
     , m_attribute(attribute)
     , m_value(value)
 {
     ASSERT(m_element);
 }
 
 void SetNodeAttributeCommand::doApply()
 {
     m_oldValue = m_element->getAttribute(m_attribute);
     m_element->setAttribute(m_attribute, m_value);
 }
 
 void SetNodeAttributeCommand::doUnapply()
 {
     m_element->setAttribute(m_attribute, m_oldValue);
     StringImpl* nullString = 0;
     m_oldValue = nullString;
 }
 
 #ifndef NDEBUG
 void SetNodeAttributeCommand::getNodesInCommand(HashSet<Node*>& nodes)
 {
     addNodeAndDescendants(m_element.get(), nodes);
 }
 #endif
 
 } // namespace WebCore