Add toHTMLDocument() convenience methods that take a reference

Source/core/html/HTMLIFrameElement.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2000 Simon Hausmann (hausmann@kde.org)
  *           (C) 2001 Dirk Mueller (mueller@kde.org)
  * Copyright (C) 2004, 2006, 2008, 2009 Apple Inc. All rights reserved.
  * Copyright (C) 2009 Ericsson AB. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
@@ skipping 61 matching lines @@
             addPropertyToPresentationAttributeStyle(style, CSSPropertyBorderWidth, 0, CSSPrimitiveValue::CSS_PX);
         }
     } else
         HTMLFrameElementBase::collectStyleForPresentationAttribute(name, value, style);
 }
 
 void HTMLIFrameElement::parseAttribute(const QualifiedName& name, const AtomicString& value)
 {
     if (name == nameAttr) {
         if (inDocument() && document().isHTMLDocument() && !isInShadowTree()) {
-            HTMLDocument* document = toHTMLDocument(&this->document());
-            document->removeExtraNamedItem(m_name);
-            document->addExtraNamedItem(value);
+            HTMLDocument& document = toHTMLDocument(this->document());
+            document.removeExtraNamedItem(m_name);
+            document.addExtraNamedItem(value);
         }
         m_name = value;
     } else if (name == sandboxAttr) {
         String invalidTokens;
         setSandboxFlags(value.isNull() ? SandboxNone : SecurityContext::parseSandboxPolicy(value, invalidTokens));
         if (!invalidTokens.isNull())
             document().addConsoleMessage(OtherMessageSource, ErrorMessageLevel, "Error while parsing the 'sandbox' attribute: " + invalidTokens);
     } else if (name == seamlessAttr) {
         // If we're adding or removing the seamless attribute, we need to force the content document to recalculate its StyleResolver.
         if (contentDocument())
             contentDocument()->styleResolverChanged(RecalcStyleDeferred);
     } else
         HTMLFrameElementBase::parseAttribute(name, value);
 }
 
 bool HTMLIFrameElement::rendererIsNeeded(const NodeRenderingContext& context)
 {
     return isURLAllowed() && context.style()->display() != NONE;
 }
 
 RenderObject* HTMLIFrameElement::createRenderer(RenderStyle*)
 {
     return new RenderIFrame(this);
 }
 
 Node::InsertionNotificationRequest HTMLIFrameElement::insertedInto(ContainerNode* insertionPoint)
 {
     InsertionNotificationRequest result = HTMLFrameElementBase::insertedInto(insertionPoint);
     if (insertionPoint->inDocument() && document().isHTMLDocument() && !insertionPoint->isInShadowTree())
-        toHTMLDocument(&document())->addExtraNamedItem(m_name);
+        toHTMLDocument(document()).addExtraNamedItem(m_name);
     return result;
 }
 
 void HTMLIFrameElement::removedFrom(ContainerNode* insertionPoint)
 {
     HTMLFrameElementBase::removedFrom(insertionPoint);
     if (insertionPoint->inDocument() && document().isHTMLDocument() && !insertionPoint->isInShadowTree())
-        toHTMLDocument(&document())->removeExtraNamedItem(m_name);
+        toHTMLDocument(document()).removeExtraNamedItem(m_name);
 }
 
 bool HTMLIFrameElement::shouldDisplaySeamlessly() const
 {
     return contentDocument() && contentDocument()->shouldDisplaySeamlesslyWithParent();
 }
 
 void HTMLIFrameElement::didRecalcStyle(StyleChange styleChange)
 {
     if (!shouldDisplaySeamlessly())
         return;
     Document* childDocument = contentDocument();
     if (shouldRecalcStyle(styleChange, childDocument))
         contentDocument()->recalcStyle(styleChange);
 }
 
 }