Use SubSelector as relation on left-most selector

Source/core/css/parser/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 293 matching lines @@
     end->setRelation(relation);
     end->setTagHistory(selector);
 }
 
 void CSSParserSelector::prependTagSelector(const QualifiedName& tagQName, bool tagIsForNamespaceRule)
 {
     OwnPtr<CSSParserSelector> second = adoptPtr(new CSSParserSelector);
     second->m_selector = m_selector.release();
     second->m_tagHistory = m_tagHistory.release();
     m_tagHistory = second.release();
-
     m_selector = adoptPtr(new CSSSelector(tagQName, tagIsForNamespaceRule));
-    m_selector->setRelation(CSSSelector::SubSelector);
 }
 
 bool CSSParserSelector::hasHostPseudoSelector() const
 {
     for (CSSParserSelector* selector = const_cast<CSSParserSelector*>(this); selector; selector = selector->tagHistory()) {
         if (selector->pseudoType() == CSSSelector::PseudoHost || selector->pseudoType() == CSSSelector::PseudoHostContext)
             return true;
     }
     return false;
 }
 
 } // namespace blink