Remove AtomicStringImpl.

Source/core/css/resolver/ScopedStyleResolver.h

Index: Source/core/css/resolver/ScopedStyleResolver.h
diff --git a/Source/core/css/resolver/ScopedStyleResolver.h b/Source/core/css/resolver/ScopedStyleResolver.h
index 57d503ea0d2607269c8b3cafe0e937f6408e2846..f63034d36b34c8e2224aaa286952c38c5edadd57 100644
--- a/Source/core/css/resolver/ScopedStyleResolver.h
+++ b/Source/core/css/resolver/ScopedStyleResolver.h
@@ -63,7 +63,7 @@ public:
 
 public:
     bool checkRegionStyle(Element*);
-    const StyleRuleKeyframes* keyframeStylesForAnimation(const AtomicStringImpl* animationName);
+    const StyleRuleKeyframes* keyframeStylesForAnimation(const StringImpl* animationName);
     void addKeyframeStyle(PassRefPtr<StyleRuleKeyframes>);
 
     void matchHostRules(ElementRuleCollector&, bool includeEmptyRules);
@@ -89,7 +89,7 @@ private:
     OwnPtr<RuleSet> m_authorStyle;
     HashMap<const ShadowRoot*, OwnPtr<RuleSet> > m_atHostRules;
 
-    typedef HashMap<const AtomicStringImpl*, RefPtr<StyleRuleKeyframes> > KeyframesRuleMap;
+    typedef HashMap<const StringImpl*, RefPtr<StyleRuleKeyframes> > KeyframesRuleMap;
     KeyframesRuleMap m_keyframesRuleMap;
 };