Have Node::document() return a reference instead of a pointer

Source/core/html/HTMLKeygenElement.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) 2004, 2005, 2006, 2010 Apple Inc. All rights reserved.
  *           (C) 2006 Alexey Proskuryakov (ap@nypop.com)
  *
  * 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 40 matching lines @@
 }
 
 void HTMLKeygenElement::didAddUserAgentShadowRoot(ShadowRoot* root)
 {
     DEFINE_STATIC_LOCAL(AtomicString, keygenSelectPseudoId, ("-webkit-keygen-select", AtomicString::ConstructFromLiteral));
 
     Vector<String> keys;
     getSupportedKeySizes(keys);
 
     // Create a select element with one option element for each key size.
-    RefPtr<HTMLSelectElement> select = HTMLSelectElement::create(document());
+    RefPtr<HTMLSelectElement> select = HTMLSelectElement::create(&document());
     select->setPart(keygenSelectPseudoId);
     for (size_t i = 0; i < keys.size(); ++i) {
-        RefPtr<HTMLOptionElement> option = HTMLOptionElement::create(document());
-        option->appendChild(Text::create(document(), keys[i]));
+        RefPtr<HTMLOptionElement> option = HTMLOptionElement::create(&document());
+        option->appendChild(Text::create(&document(), keys[i]));
         select->appendChild(option);
     }
 
     root->appendChild(select);
 }
 
 void HTMLKeygenElement::parseAttribute(const QualifiedName& name, const AtomicString& value)
 {
     // Reflect disabled attribute on the shadow select element
     if (name == disabledAttr)
         shadowSelect()->setAttribute(name, value);
 
     HTMLFormControlElement::parseAttribute(name, value);
 }
 
 bool HTMLKeygenElement::appendFormData(FormDataList& encoding, bool)
 {
     // Only RSA is supported at this time.
     const AtomicString& keyType = fastGetAttribute(keytypeAttr);
     if (!keyType.isNull() && !equalIgnoringCase(keyType, "rsa"))
         return false;
-    String value = signedPublicKeyAndChallengeString(shadowSelect()->selectedIndex(), fastGetAttribute(challengeAttr), document()->baseURL());
+    String value = signedPublicKeyAndChallengeString(shadowSelect()->selectedIndex(), fastGetAttribute(challengeAttr), document().baseURL());
     if (value.isNull())
         return false;
     encoding.appendData(name(), value.utf8());
     return true;
 }
 
 const AtomicString& HTMLKeygenElement::formControlType() const
 {
     DEFINE_STATIC_LOCAL(const AtomicString, keygen, ("keygen", AtomicString::ConstructFromLiteral));
     return keygen;
 }
 
 void HTMLKeygenElement::reset()
 {
     shadowSelect()->reset();
 }
 
 HTMLSelectElement* HTMLKeygenElement::shadowSelect() const
 {
     ShadowRoot* root = userAgentShadowRoot();
     return root ? toHTMLSelectElement(root->firstChild()) : 0;
 }
 
 } // namespace