Use C++11 range-based loop for core/css

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 36988a61e35c7cb64939dbeb254d2dce2ad54e31..efc9ec94dd083e5b603018f773f3908e70cbd079 100644
--- a/Source/core/css/ElementRuleCollector.h
+++ b/Source/core/css/ElementRuleCollector.h
@@ -141,8 +141,8 @@ private:
         if (!rules)
             return;
 
-        for (typename RuleDataListType::const_iterator it = rules->begin(), end = rules->end(); it != end; ++it)
-            collectRuleIfMatches(*it, cascadeScope, cascadeOrder, matchRequest, ruleRange);
+        for (const auto& rule : *rules)
+            collectRuleIfMatches(rule, cascadeScope, cascadeOrder, matchRequest, ruleRange);
     }
 
     bool ruleMatches(const RuleData&, const ContainerNode* scope, SelectorChecker::MatchResult*);