Revert of Allow canvases to be GPU-accelerated in Workers

third_party/WebKit/Source/core/frame/ImageBitmap.cpp

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "core/frame/ImageBitmap.h"
 
 #include "core/html/HTMLCanvasElement.h"
 #include "core/html/HTMLVideoElement.h"
 #include "core/html/ImageData.h"
 #include "platform/graphics/skia/SkiaUtils.h"
@@ skipping 572 matching lines @@
 
 ImageBitmap::ImageBitmap(PassRefPtr<StaticBitmapImage> image)
 {
     m_image = image;
 }
 
 PassRefPtr<StaticBitmapImage> ImageBitmap::transfer()
 {
     ASSERT(!isNeutered());
     m_isNeutered = true;
-    m_image->transfer();
     return m_image.release();
 }
 
 ImageBitmap::~ImageBitmap()
 {
 }
 
 ImageBitmap* ImageBitmap::create(HTMLImageElement* image, Optional<IntRect> cropRect, Document* document, const ImageBitmapOptions& options)
 {
     return new ImageBitmap(image, cropRect, document, options);
@@ skipping 107 matching lines @@
 FloatSize ImageBitmap::elementSize(const FloatSize&) const
 {
     return FloatSize(width(), height());
 }
 
 DEFINE_TRACE(ImageBitmap)
 {
 }
 
 } // namespace blink