Use SubSelector as relation on left-most selector

Source/core/css/parser/CSSParserValues.cpp

Index: Source/core/css/parser/CSSParserValues.cpp
diff --git a/Source/core/css/parser/CSSParserValues.cpp b/Source/core/css/parser/CSSParserValues.cpp
index db68d66cc2d76ce028445013246ad52d577c879e..7be52cbbcdda0437f19c2b2b15e44c98cdf5d085 100644
--- a/Source/core/css/parser/CSSParserValues.cpp
+++ b/Source/core/css/parser/CSSParserValues.cpp
@@ -311,9 +311,7 @@ void CSSParserSelector::prependTagSelector(const QualifiedName& tagQName, bool t
     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