Simplify handling of Transferable objects while (de)serializing.

third_party/WebKit/Source/bindings/core/v8/TransferableArrayBuffer.h

-// Copyright 2016 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 TransferableArrayBuffer_h
-#define TransferableArrayBuffer_h
-
-#include "bindings/core/v8/Transferable.h"
-#include "core/CoreExport.h"
-#include "core/dom/DOMArrayBufferBase.h"
-
-namespace blink {
-
-class CORE_EXPORT TransferableArrayBuffer : public Transferable {
-public:
-    ~TransferableArrayBuffer() override { }
-    void append(DOMArrayBufferBase* arrayBuffer)
-    {
-        m_arrayBufferArray.append(arrayBuffer);
-    }
-    bool contains(DOMArrayBufferBase* arrayBuffer)
-    {
-        return m_arrayBufferArray.contains(arrayBuffer);
-    }
-    static TransferableArrayBuffer* ensure(TransferableArray& transferables)
-    {
-        if (transferables.size() <= TransferableArrayBufferType) {
-            transferables.resize(TransferableArrayBufferType + 1);
-            transferables[TransferableArrayBufferType] = new TransferableArrayBuffer();
-        }
-        return static_cast<TransferableArrayBuffer*>(transferables[TransferableArrayBufferType].get());
-    }
-    static TransferableArrayBuffer* get(TransferableArray& transferables)
-    {
-        if (transferables.size() <= TransferableArrayBufferType)
-            return nullptr;
-        return static_cast<TransferableArrayBuffer*>(transferables[TransferableArrayBufferType].get());
-    }
-    HeapVector<Member<DOMArrayBufferBase>, 1>& getArray()
-    {
-        return m_arrayBufferArray;
-    }
-    DEFINE_INLINE_TRACE()
-    {
-        visitor->trace(m_arrayBufferArray);
-        Transferable::trace(visitor);
-    }
-private:
-    HeapVector<Member<DOMArrayBufferBase>, 1> m_arrayBufferArray;
-};
-
-} // namespace blink
-
-#endif // TransferableArrayBuffer_h