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

Source/core/frame/UseCounter.h

 /*
  * Copyright (C) 2012 Google, Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 294 matching lines @@
 
         SVGForeignObjectElement = 325,
         SelectionSetPosition = 327,
         AnimationPlayerFinishEvent = 328,
         SVGSVGElementInXMLDocument = 329,
         PrefixedPerformanceClearResourceTimings = 341,
         PrefixedPerformanceSetResourceTimingBufferSize = 342,
         EventSrcElement = 343,
         EventCancelBubble = 344,
         EventPath = 345,
-        EventClipboardData = 346,
         NodeIteratorDetach = 347,
         AttrNodeValue = 348,
         AttrTextContent = 349,
         EventGetReturnValueTrue = 350,
         EventGetReturnValueFalse = 351,
         EventSetReturnValueTrue = 352,
         EventSetReturnValueFalse = 353,
         WindowOffscreenBuffering = 356,
         WindowDefaultStatus = 357,
         WindowDefaultstatus = 358,
@@ skipping 310 matching lines @@
 
     void updateMeasurements();
 
     OwnPtr<BitVector> m_countBits;
     BitVector m_CSSFeatureBits;
 };
 
 } // namespace blink
 
 #endif // UseCounter_h