Cheaper thread-safe atomic initialization of static references.

Source/wtf/ArrayBuffer.h

 /*
  * Copyright (C) 2009 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 48 matching lines @@
     // ranging from |begin| upto but not including |end|.
     inline PassRefPtr<ArrayBuffer> slice(int begin, int end) const;
     inline PassRefPtr<ArrayBuffer> slice(int begin) const;
 
     void addView(ArrayBufferView*);
     void removeView(ArrayBufferView*);
 
     bool transfer(ArrayBufferContents&);
     bool isNeutered() { return m_isNeutered; }
 
-    void setDeallocationObserver(ArrayBufferDeallocationObserver* observer)
+    void setDeallocationObserver(ArrayBufferDeallocationObserver& observer)
     {
         m_contents.setDeallocationObserver(observer);
     }
-    void setDeallocationObserverWithoutAllocationNotification(ArrayBufferDeallocationObserver* observer)
+    void setDeallocationObserverWithoutAllocationNotification(ArrayBufferDeallocationObserver& observer)
     {
         m_contents.setDeallocationObserverWithoutAllocationNotification(observer);
     }
 
     ~ArrayBuffer() { }
 
 protected:
     inline explicit ArrayBuffer(ArrayBufferContents&);
 
 private:
@@ skipping 111 matching lines @@
     if (index < 0)
         index = currentLength + index;
     return clampValue(index, 0, currentLength);
 }
 
 } // namespace WTF
 
 using WTF::ArrayBuffer;
 
 #endif // ArrayBuffer_h