Revert of Make OffscreenCanvas Transferable

third_party/WebKit/Source/bindings/modules/v8/TransferablesForModules.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 TransferablesForModules_h
-#define TransferablesForModules_h
-
-#include "bindings/core/v8/Transferables.h"
-#include "modules/ModulesExport.h"
-#include "modules/offscreencanvas/OffscreenCanvas.h"
-
-namespace blink {
-
-using OffscreenCanvasArray = HeapVector<Member<OffscreenCanvas>>;
-
-class MODULES_EXPORT TransferablesForModules : public Transferables {
-public:
-    TransferablesForModules() { }
-
-    OffscreenCanvasArray offscreenCanvases;
-
-    DEFINE_INLINE_TRACE()
-    {
-        visitor->trace(offscreenCanvases);
-        Transferables::trace(visitor);
-    }
-};
-
-} // namespace blink
-
-#endif // TransferablesForModules_h