Update WebKit IDLs after chrome roll.

html/canvas/OESVertexArrayObject.idl

 /*
  * Copyright (C) 2011 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
  *    documentation and/or other materials provided with the distribution.
  *
  * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY
  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE COMPUTER, INC. OR
  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
  * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 
  */
 
 [
     Conditional=WEBGL, 
-    JSGenerateIsReachable=ImplContext,
     OmitConstructor, 
     DoNotCheckConstants
 ] interface OESVertexArrayObject {
     const unsigned int VERTEX_ARRAY_BINDING_OES = 0x85B5;
     
     [StrictTypeChecking] WebGLVertexArrayObjectOES createVertexArrayOES();
     [StrictTypeChecking] void         deleteVertexArrayOES(in [Optional=DefaultIsUndefined] WebGLVertexArrayObjectOES arrayObject);
     [StrictTypeChecking] boolean      isVertexArrayOES(in [Optional=DefaultIsUndefined] WebGLVertexArrayObjectOES arrayObject);
     [StrictTypeChecking] void         bindVertexArrayOES(in [Optional=DefaultIsUndefined] WebGLVertexArrayObjectOES arrayObject) raises(DOMException);
 };