Remove ArrayBufferDeallocationObserver

Source/core/dom/DOMArrayBufferDeallocationObserver.h

Index: Source/core/dom/DOMArrayBufferDeallocationObserver.h
diff --git a/Source/core/dom/DOMArrayBufferDeallocationObserver.h b/Source/core/dom/DOMArrayBufferDeallocationObserver.h
deleted file mode 100644
index e6f13b390e6bcfc740009f47559925d86790855f..0000000000000000000000000000000000000000
--- a/Source/core/dom/DOMArrayBufferDeallocationObserver.h
+++ /dev/null
@@ -1,25 +0,0 @@
-// Copyright 2014 The Chromium Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-#ifndef DOMArrayBufferDeallocationObserver_h
-#define DOMArrayBufferDeallocationObserver_h
-
-#include "core/CoreExport.h"
-#include "wtf/ArrayBufferDeallocationObserver.h"
-
-namespace blink {
-
-class DOMArrayBufferDeallocationObserver final : public WTF::ArrayBufferDeallocationObserver {
-public:
-    CORE_EXPORT static DOMArrayBufferDeallocationObserver& instance();
-
-    virtual void arrayBufferDeallocated(unsigned sizeInBytes) override;
-
-protected:
-    virtual void blinkAllocatedMemory(unsigned sizeInBytes) override;
-};
-
-} // namespace blink
-
-#endif // DOMArrayBufferDeallocationObserver_h