Remove unused functions from ElementRuleCollector

Source/core/css/ElementRuleCollector.h

Index: Source/core/css/ElementRuleCollector.h
diff --git a/Source/core/css/ElementRuleCollector.h b/Source/core/css/ElementRuleCollector.h
index fc6244db858b8e77a19eb35924fa52f2ea928529..872f47461e8c13f1993b5a67ea5503a12843c67f 100644
--- a/Source/core/css/ElementRuleCollector.h
+++ b/Source/core/css/ElementRuleCollector.h
@@ -131,10 +131,6 @@ public:
     void clearMatchedRules();
     void addElementStyleProperties(const StylePropertySet*, bool isCacheable = true);
 
-    unsigned lastMatchedRulesPosition() const { return m_matchedRules ? m_matchedRules->size() : 0; }
-    void sortMatchedRulesFrom(unsigned position);
-    void sortAndTransferMatchedRulesWithOnlySortBySpecificity();
-
 private:
     void collectRuleIfMatches(const RuleData&, SelectorChecker::ContextFlags, CascadeScope, CascadeOrder, const MatchRequest&, RuleRange&);