Remove ArrayBufferDeallocationObserver

Source/core/dom/DOMArrayBuffer.h

Index: Source/core/dom/DOMArrayBuffer.h
diff --git a/Source/core/dom/DOMArrayBuffer.h b/Source/core/dom/DOMArrayBuffer.h
index d63e23d4d67a84e17b737aa1f3ec078553054a76..f5c605af68956cb4241f545ad462f50f365f3a08 100644
--- a/Source/core/dom/DOMArrayBuffer.h
+++ b/Source/core/dom/DOMArrayBuffer.h
@@ -7,7 +7,6 @@
 
 #include "bindings/core/v8/ScriptWrappable.h"
 #include "core/CoreExport.h"
-#include "core/dom/DOMArrayBufferDeallocationObserver.h"
 #include "wtf/ArrayBuffer.h"
 #include "wtf/RefCounted.h"
 
@@ -56,10 +55,6 @@ public:
     }
     bool transfer(WTF::ArrayBufferContents& result) { return buffer()->transfer(result); }
     bool isNeutered() { return buffer()->isNeutered(); }
-    void setDeallocationObserver(DOMArrayBufferDeallocationObserver& observer)
-    {
-        buffer()->setDeallocationObserver(observer);
-    }
 
     virtual v8::Local<v8::Object> wrap(v8::Isolate*, v8::Local<v8::Object> creationContext) override;
     virtual v8::Local<v8::Object> associateWithWrapper(v8::Isolate*, const WrapperTypeInfo*, v8::Local<v8::Object> wrapper) override;