[bindings] Avoid using custom bindings for handling clipboardData on Event idl interface.

Source/bindings/core/v8/custom/V8EventCustom.cpp

-/*
- * Copyright (C) 2010 Google Inc. All rights reserved.
- *
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- * modification, are permitted provided that the following conditions are
- * met:
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- * contributors may be used to endorse or promote products derived from
- * this software without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
- * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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-
-#include "config.h"
-#include "bindings/core/v8/V8Event.h"
-
-#include "bindings/core/v8/V8Binding.h"
-#include "bindings/core/v8/V8DataTransfer.h"
-#include "core/clipboard/DataTransfer.h"
-#include "core/events/ClipboardEvent.h"
-#include "core/events/Event.h"
-
-namespace blink {
-
-void V8Event::clipboardDataAttributeGetterCustom(const v8::PropertyCallbackInfo<v8::Value>& info)
-{
-    Event* event = V8Event::toImpl(info.Holder());
-
-    if (event->isClipboardEvent()) {
-        v8SetReturnValueFast(info, static_cast<ClipboardEvent*>(event)->clipboardData(), event);
-        return;
-    }
-}
-
-} // namespace blink