Have StyleElement API take Document as a reference

Source/core/html/HTMLStyleElement.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2001 Dirk Mueller (mueller@kde.org)
  * Copyright (C) 2003, 2010 Apple Inc. All rights reserved.
  *           (C) 2007 Rob Buis (buis@kde.org)
  *
  * 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 41 matching lines @@
     , m_scopedStyleRegistrationState(NotRegistered)
 {
     ASSERT(hasTagName(styleTag));
     ScriptWrappable::init(this);
 }
 
 HTMLStyleElement::~HTMLStyleElement()
 {
     // During tear-down, willRemove isn't called, so m_scopedStyleRegistrationState may still be RegisteredAsScoped or RegisteredInShadowRoot here.
     // Therefore we can't ASSERT(m_scopedStyleRegistrationState == NotRegistered).
-    StyleElement::clearDocumentData(&document(), this);
+    StyleElement::clearDocumentData(document(), this);
 
     styleLoadEventSender().cancelEvent(this);
 }
 
 PassRefPtr<HTMLStyleElement> HTMLStyleElement::create(const QualifiedName& tagName, Document* document, bool createdByParser)
 {
     return adoptRef(new HTMLStyleElement(tagName, document, createdByParser));
 }
 
 void HTMLStyleElement::parseAttribute(const QualifiedName& name, const AtomicString& value)
@@ skipping 122 matching lines @@
         if (m_scopedStyleRegistrationState == RegisteredInShadowRoot) {
             scope = containingShadowRoot();
             if (!scope)
                 scope = insertionPoint->containingShadowRoot();
         } else
             scope = parentNode() ? parentNode() : insertionPoint;
         unregisterWithScopingNode(scope);
     }
 
     if (insertionPoint->inDocument())
-        StyleElement::removedFromDocument(&document(), this, scope);
+        StyleElement::removedFromDocument(document(), this, scope);
 }
 
 void HTMLStyleElement::didNotifySubtreeInsertions(ContainerNode* insertionPoint)
 {
-    StyleElement::processStyleSheet(&document(), this);
+    StyleElement::processStyleSheet(document(), this);
 }
 
 void HTMLStyleElement::childrenChanged(bool changedByParser, Node* beforeChange, Node* afterChange, int childCountDelta)
 {
     HTMLElement::childrenChanged(changedByParser, beforeChange, afterChange, childCountDelta);
     StyleElement::childrenChanged(this);
 }
 
 const AtomicString& HTMLStyleElement::media() const
 {
@@ skipping 65 matching lines @@
     return m_sheet->disabled();
 }
 
 void HTMLStyleElement::setDisabled(bool setDisabled)
 {
     if (CSSStyleSheet* styleSheet = sheet())
         styleSheet->setDisabled(setDisabled);
 }
 
 }