Use new is*Element() helper functions in CSS code

Source/core/css/resolver/SharedStyleFinder.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 2004-2005 Allan Sandfeld Jensen (kde@carewolf.com)
  * Copyright (C) 2006, 2007 Nicholas Shanks (webkit@nickshanks.com)
  * Copyright (C) 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013 Apple Inc. All rights reserved.
  * Copyright (C) 2007 Alexey Proskuryakov <ap@webkit.org>
  * Copyright (C) 2007, 2008 Eric Seidel <eric@webkit.org>
  * Copyright (C) 2008, 2009 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
  * Copyright (c) 2011, Code Aurora Forum. All rights reserved.
  * Copyright (C) Research In Motion Limited 2011. All rights reserved.
@@ skipping 40 matching lines @@
 #include "core/svg/SVGElement.h"
 #include "wtf/HashSet.h"
 #include "wtf/text/AtomicString.h"
 
 namespace WebCore {
 
 using namespace HTMLNames;
 
 bool SharedStyleFinder::canShareStyleWithControl(Element& candidate) const
 {
-    if (!candidate.hasTagName(inputTag) || !element().hasTagName(inputTag))
+    if (!isHTMLInputElement(candidate) || !isHTMLInputElement(element()))
         return false;
 
     HTMLInputElement& candidateInput = toHTMLInputElement(candidate);
     HTMLInputElement& thisInput = toHTMLInputElement(element());
 
     if (candidateInput.isAutofilled() != thisInput.isAutofilled())
         return false;
     if (candidateInput.shouldAppearChecked() != thisInput.shouldAppearChecked())
         return false;
     if (candidateInput.shouldAppearIndeterminate() != thisInput.shouldAppearIndeterminate())
@@ skipping 72 matching lines @@
     } else {
         return false;
     }
 
     if (element().presentationAttributeStyle() != candidate.presentationAttributeStyle())
         return false;
 
     // FIXME: Consider removing this, it's unlikely we'll have so many progress elements
     // that sharing the style makes sense. Instead we should just not support style sharing
     // for them.
-    if (element().hasTagName(progressTag)) {
+    if (isHTMLProgressElement(element())) {
         if (element().shouldAppearIndeterminate() != candidate.shouldAppearIndeterminate())
             return false;
     }
 
     return true;
 }
 
 bool SharedStyleFinder::sharingCandidateShadowHasSharedStyleSheetContents(Element& candidate) const
 {
     if (!element().shadow() || !element().shadow()->containsActiveStyles())
@@ skipping 169 matching lines @@
     // Tracking child index requires unique style for each node. This may get set by the sibling rule match above.
     if (!SiblingRuleHelper(element().parentElementOrShadowRoot()).childrenSupportStyleSharing()) {
         INCREMENT_STYLE_STATS_COUNTER(m_styleResolver, sharedStyleRejectedByParent);
         return 0;
     }
 
     return shareElement->renderStyle();
 }
 
 }