Add support for case-insensitive attribute value selectors

Source/core/css/CSSParserValues.h

Index: Source/core/css/CSSParserValues.h
diff --git a/Source/core/css/CSSParserValues.h b/Source/core/css/CSSParserValues.h
index 0c1960a07ec4dedba8f1fdd7c4a14c076d21833d..e5a517d9eb7fe1b4590fe87ab902643dbeff60ca 100644
--- a/Source/core/css/CSSParserValues.h
+++ b/Source/core/css/CSSParserValues.h
@@ -220,7 +220,7 @@ public:
 
     CSSSelector::Relation relation() const { return m_selector->relation(); }
     void setValue(const AtomicString& value) { m_selector->setValue(value); }
-    void setAttribute(const QualifiedName& value) { m_selector->setAttribute(value); }
+    void setAttribute(const QualifiedName& value, unsigned flags) { m_selector->setAttribute(value, flags); }
     void setArgument(const AtomicString& value) { m_selector->setArgument(value); }
     void setMatch(CSSSelector::Match value) { m_selector->m_match = value; }
     void setRelation(CSSSelector::Relation value) { m_selector->m_relation = value; }