Remove iframe@seamless

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 809 matching lines @@
             }
             return false;
         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 (!FullscreenElementStack::isFullScreen(&element.document()))
                 return false;
             return true;
-        case CSSSelector::PseudoSeamlessDocument:
-            // While a document is rendered in a seamless iframe, the 'seamless-document' pseudoclass applies
-            // to all elements of that Document.
-            return element.document().shouldDisplaySeamlesslyWithParent();
         case CSSSelector::PseudoInRange:
             element.document().setContainsValidityStyleRules();
             return element.isInRange();
         case CSSSelector::PseudoOutOfRange:
             element.document().setContainsValidityStyleRules();
             return element.isOutOfRange();
         case CSSSelector::PseudoFutureCue:
             return (element.isVTTElement() && !toVTTElement(element).isPastNode());
         case CSSSelector::PseudoPastCue:
             return (element.isVTTElement() && toVTTElement(element).isPastNode());
@@ skipping 232 matching lines @@
     return element.focused() && isFrameFocused(element);
 }
 
 template
 SelectorChecker::Match SelectorChecker::match(const SelectorCheckingContext&, const DOMSiblingTraversalStrategy&, MatchResult*) const;
 
 template
 SelectorChecker::Match SelectorChecker::match(const SelectorCheckingContext&, const ShadowDOMSiblingTraversalStrategy&, MatchResult*) const;
 
 }