Have EditCommand classes deal with Document references, not pointers

Source/core/editing/MergeIdenticalElementsCommand.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/MergeIdenticalElementsCommand.h"
 
 #include "bindings/v8/ExceptionState.h"
 #include "bindings/v8/ExceptionStatePlaceholder.h"
 #include "core/dom/Element.h"
 
 namespace WebCore {
 
 MergeIdenticalElementsCommand::MergeIdenticalElementsCommand(PassRefPtr<Element> first, PassRefPtr<Element> second)
-    : SimpleEditCommand(&first->document())
+    : SimpleEditCommand(first->document())
     , m_element1(first)
     , m_element2(second)
 {
     ASSERT(m_element1);
     ASSERT(m_element2);
     ASSERT(m_element1->nextSibling() == m_element2);
 }
 
 void MergeIdenticalElementsCommand::doApply()
 {
@@ skipping 41 matching lines @@
 
 #ifndef NDEBUG
 void MergeIdenticalElementsCommand::getNodesInCommand(HashSet<Node*>& nodes)
 {
     addNodeAndDescendants(m_element1.get(), nodes);
     addNodeAndDescendants(m_element2.get(), nodes);
 }
 #endif
 
 } // namespace WebCore