Only :host and :ancestor should ever match the host in a ShadowRoot

Source/core/css/CSSParserValues.cpp

 /*
  * Copyright (C) 2003 Lars Knoll (knoll@kde.org)
  * Copyright (C) 2004, 2005, 2006, 2008 Apple Inc. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
  *
  * This library is distributed in the hope that it will be useful,
@@ skipping 240 matching lines @@
 CSSParserSelector* CSSParserSelector::findDistributedPseudoElementSelector() const
 {
     CSSParserSelector* selector = const_cast<CSSParserSelector*>(this);
     do {
         if (selector->isDistributedPseudoElement())
             return selector;
     } while ((selector = selector->tagHistory()));
     return 0;
 }
 
+bool CSSParserSelector::hasHostPseudoSelector() const
+{
+    CSSParserSelector* selector = const_cast<CSSParserSelector*>(this);
+    do {
+        if (selector->pseudoType() == CSSSelector::PseudoHost || selector->pseudoType() == CSSSelector::PseudoAncestor)
+            return true;
+    } while ((selector = selector->tagHistory()));
+    return false;
+}
+
 } // namespace WebCore