Remove webkitIsFullScreen everywhere except in bindings

Source/core/css/SelectorChecker.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 837 matching lines @@
                     break;
                 return true;
             }
         case CSSSelector::PseudoFullScreen:
             // While a Document is in the fullscreen state, and the document's current fullscreen
             // element is an element in the document, the 'full-screen' pseudoclass applies to
             // that element. Also, an <iframe>, <object> or <embed> element whose child browsing
             // context's Document is in the fullscreen state has the 'full-screen' pseudoclass applied.
             if (isHTMLFrameElementBase(element) && element.containsFullScreenElement())
                 return true;
-            if (Fullscreen* fullscreen = Fullscreen::fromIfExists(element.document())) {
-                if (!fullscreen->webkitIsFullScreen())
-                    return false;
-                return element == fullscreen->webkitCurrentFullScreenElement();
-            }
-            return false;
+            return Fullscreen::isActiveFullScreenElement(element);
         case CSSSelector::PseudoFullScreenAncestor:
             return element.containsFullScreenElement();
         case CSSSelector::PseudoFullScreenDocument:
             // While a Document is in the fullscreen state, the 'full-screen-document' pseudoclass applies
             // to all elements of that Document.
             if (!Fullscreen::isFullScreen(element.document()))
                 return false;
             return true;
         case CSSSelector::PseudoInRange:
             element.document().setContainsValidityStyleRules();
@@ skipping 263 matching lines @@
     return isHTMLSelectElement(element) && !toHTMLSelectElement(element).usesMenuList();
 }
 
 template
 SelectorChecker::Match SelectorChecker::match(const SelectorCheckingContext&, const DOMSiblingTraversalStrategy&, MatchResult*) const;
 
 template
 SelectorChecker::Match SelectorChecker::match(const SelectorCheckingContext&, const ShadowDOMSiblingTraversalStrategy&, MatchResult*) const;
 
 }