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

Source/core/events/ClipboardEvent.h

 /*
  * Copyright (C) 2001 Peter Kelly (pmk@post.com)
  * Copyright (C) 2001 Tobias Anton (anton@stud.fbi.fh-darmstadt.de)
  * Copyright (C) 2006 Samuel Weinig (sam.weinig@gmail.com)
  * Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008 Apple Inc. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
  *
  * This library is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  * Library General Public License for more details.
  *
  * You should have received a copy of the GNU Library General Public License
  * along with this library; see the file COPYING.LIB.  If not, write to
  * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
  * Boston, MA 02110-1301, USA.
  *
  */
 
 #ifndef ClipboardEvent_h
 #define ClipboardEvent_h
 
+#include "core/clipboard/DataTransfer.h"
 #include "core/events/Event.h"
 
 namespace blink {
 
-class DataTransfer;
-
 class ClipboardEvent final : public Event {
+    DEFINE_WRAPPERTYPEINFO();
 public:
     virtual ~ClipboardEvent();
+    static PassRefPtrWillBeRawPtr<ClipboardEvent> create()
+    {
+        return adoptRefWillBeNoop(new ClipboardEvent());
+    }
 
     static PassRefPtrWillBeRawPtr<ClipboardEvent> create(const AtomicString& type, bool canBubble, bool cancelable, PassRefPtrWillBeRawPtr<DataTransfer> dataTransfer)
     {
         return adoptRefWillBeNoop(new ClipboardEvent(type, canBubble, cancelable, dataTransfer));
     }
 
     DataTransfer* clipboardData() const { return m_clipboardData.get(); }
 
     virtual void trace(Visitor*) override;
 
 private:
     ClipboardEvent();
     ClipboardEvent(const AtomicString& type, bool canBubble, bool cancelable, PassRefPtrWillBeRawPtr<DataTransfer> clipboardData);
 
     virtual const AtomicString& interfaceName() const override;
     virtual bool isClipboardEvent() const override;
 
     RefPtrWillBeMember<DataTransfer> m_clipboardData;
 };
 
 } // namespace blink
 
 #endif // ClipboardEvent_h