Devirtualize ScriptHeapSnapshot's destructor

Source/bindings/v8/ScriptHeapSnapshot.h

 /*
  * Copyright (c) 2010, Google 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:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 37 matching lines @@
     public:
         virtual ~OutputStream() { }
         virtual void Write(const String& chunk) = 0;
         virtual void Close() = 0;
     };
 
     static PassRefPtr<ScriptHeapSnapshot> create(const v8::HeapSnapshot* snapshot)
     {
         return adoptRef(new ScriptHeapSnapshot(snapshot));
     }
-    virtual ~ScriptHeapSnapshot();
+    ~ScriptHeapSnapshot();
 
     String title() const;
     unsigned int uid() const;
     void writeJSON(OutputStream* stream);
     SnapshotObjectId maxSnapshotJSObjectId() const;
 
 private:
     ScriptHeapSnapshot(const v8::HeapSnapshot* snapshot)
         : m_snapshot(snapshot)
     {}
 
     const v8::HeapSnapshot* m_snapshot;
 };
 
 } // namespace WebCore
 
 #endif // ScriptHeapSnapshot_h