First part of work to move V8 binding integrity off of vtables.

Source/WebCore/html/canvas/CanvasRenderingContext2D.cpp

 /*
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012 Apple Inc. All rights reserved.
  * Copyright (C) 2008, 2010 Nokia Corporation and/or its subsidiary(-ies)
  * Copyright (C) 2007 Alp Toker <alp@atoker.com>
  * Copyright (C) 2008 Eric Seidel <eric@webkit.org>
  * Copyright (C) 2008 Dirk Schulze <krit@webkit.org>
  * Copyright (C) 2010 Torch Mobile (Beijing) Co. Ltd. All rights reserved.
  * Copyright (C) 2012 Intel Corporation. All rights reserved.
  * Copyright (C) 2013 Adobe Systems Incorporated. All rights reserved.
  *
@@ skipping 128 matching lines @@
                 context->restore();
         }
     }
 }
 
 CanvasRenderingContext2D::~CanvasRenderingContext2D()
 {
 #if !ASSERT_DISABLED
     unwindStateStack();
 #endif
+    ScriptWrappable::init(this);
 }
 
 bool CanvasRenderingContext2D::isAccelerated() const
 {
 #if USE(IOSURFACE_CANVAS_BACKING_STORE) || ENABLE(ACCELERATED_2D_CANVAS)
     if (!canvas()->hasCreatedImageBuffer())
         return false;
     GraphicsContext* context = drawingContext();
     return context && context->isAcceleratedContext();
 #else
@@ skipping 2092 matching lines @@
         return;
 
     realizeSaves();
     modifiableState().m_imageSmoothingEnabled = enabled;
     GraphicsContext* c = drawingContext();
     if (c)
         c->setImageInterpolationQuality(enabled ? DefaultInterpolationQuality : InterpolationNone);
 }
 
 } // namespace WebCore