Remove AtomicStringImpl.

Source/core/page/animation/CompositeAnimation.h

Index: Source/core/page/animation/CompositeAnimation.h
diff --git a/Source/core/page/animation/CompositeAnimation.h b/Source/core/page/animation/CompositeAnimation.h
index 6d05bef220f6cfc1e6ee3d799fc1d7f6ed440a78..4866ef4a1f245935b2d2841619d99f565ccfc9e2 100644
--- a/Source/core/page/animation/CompositeAnimation.h
+++ b/Source/core/page/animation/CompositeAnimation.h
@@ -89,12 +89,12 @@ private:
     void updateKeyframeAnimations(RenderObject*, RenderStyle* currentStyle, RenderStyle* targetStyle);
     
     typedef HashMap<int, RefPtr<ImplicitAnimation> > CSSPropertyTransitionsMap;
-    typedef HashMap<AtomicStringImpl*, RefPtr<KeyframeAnimation> >  AnimationNameMap;
+    typedef HashMap<StringImpl*, RefPtr<KeyframeAnimation> >  AnimationNameMap;
 
     AnimationControllerPrivate* m_animationController;
     CSSPropertyTransitionsMap m_transitions;
     AnimationNameMap m_keyframeAnimations;
-    Vector<AtomicStringImpl*> m_keyframeAnimationOrderMap;
+    Vector<StringImpl*> m_keyframeAnimationOrderMap;
     bool m_suspended;
 };