Introduce toHTMLLinkElement

Source/core/dom/StyleSheetCollection.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2001 Dirk Mueller (mueller@kde.org)
  *           (C) 2006 Alexey Proskuryakov (ap@webkit.org)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2011, 2012 Apple Inc. All rights reserved.
  * Copyright (C) 2008, 2009 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
  * Copyright (C) 2008, 2009, 2011, 2012 Google Inc. All rights reserved.
  * Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies)
  * Copyright (C) Research In Motion Limited 2010-2011. All rights reserved.
@@ skipping 95 matching lines @@
             }
             sheet = pi->sheet();
             if (sheet && !sheet->disabled() && sheet->isCSSStyleSheet())
                 activeSheet = static_cast<CSSStyleSheet*>(sheet);
         } else if ((n->isHTMLElement() && (n->hasTagName(linkTag) || n->hasTagName(styleTag))) || (n->isSVGElement() && n->hasTagName(SVGNames::styleTag))) {
             Element* e = toElement(n);
             AtomicString title = e->getAttribute(titleAttr);
             bool enabledViaScript = false;
             if (e->hasLocalName(linkTag)) {
                 // <LINK> element
-                HTMLLinkElement* linkElement = static_cast<HTMLLinkElement*>(n);
+                HTMLLinkElement* linkElement = toHTMLLinkElement(n);
                 enabledViaScript = linkElement->isEnabledViaScript();
                 if (!linkElement->isDisabled() && linkElement->styleSheetIsLoading()) {
                     // it is loading but we should still decide which style sheet set to use
                     if (!enabledViaScript && !title.isEmpty() && collections->preferredStylesheetSetName().isEmpty()) {
                         const AtomicString& rel = e->getAttribute(relAttr);
                         if (!rel.contains("alternate")) {
                             collections->setPreferredStylesheetSetName(title);
                             collections->setSelectedStylesheetSetName(title);
                         }
                     }
@@ skipping 157 matching lines @@
 void StyleSheetCollection::reportMemoryUsage(MemoryObjectInfo* memoryObjectInfo) const
 {
     MemoryClassInfo info(memoryObjectInfo, this, WebCoreMemoryTypes::DOM);
     info.addMember(m_activeAuthorStyleSheets, "activeAuthorStyleSheets");
     info.addMember(m_styleSheetsForStyleSheetList, "styleSheetsForStyleSheetList");
     info.addMember(m_styleSheetCandidateNodes, "styleSheetCandidateNodes");
     info.addMember(m_treeScope, "treeScope");
 }
 
 }