Remove support for pseudo classes in <content select>.

Source/core/dom/Element.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2001 Peter Kelly (pmk@post.com)
  *           (C) 2001 Dirk Mueller (mueller@kde.org)
  *           (C) 2007 David Smith (catfish.man@gmail.com)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2012, 2013 Apple Inc. All rights reserved.
  *           (C) 2007 Eric Seidel (eric@webkit.org)
  *
  * This library is free software; you can redistribute it and/or
@@ skipping 1779 matching lines @@
 {
     return ensureElementRareData().ensureShadow();
 }
 
 void Element::pseudoStateChanged(CSSSelector::PseudoType pseudo)
 {
     StyleResolver* styleResolver = document().styleResolver();
 
     if (inActiveDocument() && styleResolver && styleChangeType() < SubtreeStyleChange)
         document().styleEngine().pseudoStateChangedForElement(pseudo, *this);
-
-    if (ElementShadow* elementShadow = shadowWhereNodeCanBeDistributed(*this))
-        elementShadow->distributedNodePseudoStateChanged(pseudo);
 }
 
 void Element::setAnimationStyleChange(bool animationStyleChange)
 {
     if (animationStyleChange && document().inStyleRecalc())
         return;
     if (!hasRareData())
         return;
     if (ElementAnimations* elementAnimations = elementRareData()->elementAnimations())
         elementAnimations->setAnimationStyleChange(animationStyleChange);
@@ skipping 1699 matching lines @@
 {
 #if ENABLE(OILPAN)
     if (hasRareData())
         visitor->trace(elementRareData());
     visitor->trace(m_elementData);
 #endif
     ContainerNode::trace(visitor);
 }
 
 } // namespace blink