Remove AtomicStringImpl.

Source/core/css/StyleInvalidationAnalysis.h

 /*
  * Copyright (C) 2012 Apple Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 10 matching lines @@
  * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
 #ifndef StyleInvalidationAnalysis_h
 #define StyleInvalidationAnalysis_h
 
 #include "wtf/HashSet.h"
 #include "wtf/Vector.h"
-#include "wtf/text/AtomicStringImpl.h"
+#include "wtf/text/StringImpl.h"
 
 namespace WebCore {
 
 class Document;
 class Node;
 class StyleSheetContents;
 
 class StyleInvalidationAnalysis {
 public:
     StyleInvalidationAnalysis(const Vector<StyleSheetContents*>&);
 
     bool dirtiesAllStyle() const { return m_dirtiesAllStyle; }
     void invalidateStyle(Document*);
 
 private:
 
     void analyzeStyleSheet(StyleSheetContents*);
 
     bool m_dirtiesAllStyle;
-    HashSet<AtomicStringImpl*> m_idScopes;
-    HashSet<AtomicStringImpl*> m_classScopes;
+    HashSet<StringImpl*> m_idScopes;
+    HashSet<StringImpl*> m_classScopes;
     Vector<Node*, 8> m_scopingNodes;
 };
 
 }
 
 #endif