Have EditCommand classes deal with Document references, not pointers

Source/core/editing/RemoveCSSPropertyCommand.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 16 matching lines @@
 #include "core/editing/RemoveCSSPropertyCommand.h"
 
 #include "bindings/v8/ExceptionStatePlaceholder.h"
 #include "core/css/CSSStyleDeclaration.h"
 #include "core/css/StylePropertySet.h"
 #include "core/dom/Element.h"
 #include "wtf/Assertions.h"
 
 namespace WebCore {
 
-RemoveCSSPropertyCommand::RemoveCSSPropertyCommand(Document* document, PassRefPtr<Element> element, CSSPropertyID property)
+RemoveCSSPropertyCommand::RemoveCSSPropertyCommand(Document& document, PassRefPtr<Element> element, CSSPropertyID property)
     : SimpleEditCommand(document)
     , m_element(element)
     , m_property(property)
     , m_important(false)
 {
     ASSERT(m_element);
 }
 
 RemoveCSSPropertyCommand::~RemoveCSSPropertyCommand()
 {
@@ skipping 16 matching lines @@
 }
 
 #ifndef NDEBUG
 void RemoveCSSPropertyCommand::getNodesInCommand(HashSet<Node*>& nodes)
 {
     addNodeAndDescendants(m_element.get(), nodes);
 }
 #endif
 
 } // namespace WebCore