Get rid of useless calls to AtomicString::impl()

Source/core/css/RuleFeature.cpp

Index: Source/core/css/RuleFeature.cpp
diff --git a/Source/core/css/RuleFeature.cpp b/Source/core/css/RuleFeature.cpp
index 755a4b5b2dc318d881e2c89f193cfe22b762f77b..7c8f160ae43f4d7445289aeda1ee292c72301f55 100644
--- a/Source/core/css/RuleFeature.cpp
+++ b/Source/core/css/RuleFeature.cpp
@@ -38,11 +38,11 @@ namespace WebCore {
 void RuleFeatureSet::collectFeaturesFromSelector(const CSSSelector* selector)
 {
     if (selector->m_match == CSSSelector::Id)
-        idsInRules.add(selector->value().impl());
+        idsInRules.add(selector->value());
     else if (selector->m_match == CSSSelector::Class)
-        classesInRules.add(selector->value().impl());
+        classesInRules.add(selector->value());
     else if (selector->isAttributeSelector())
-        attrsInRules.add(selector->attribute().localName().impl());
+        attrsInRules.add(selector->attribute().localName());
     switch (selector->pseudoType()) {
     case CSSSelector::PseudoFirstLine:
         m_usesFirstLineRules = true;