Remove more oilpan.

sky/engine/core/frame/ImageBitmap.h

 // 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.
 
 #ifndef ImageBitmap_h
 #define ImageBitmap_h
 
 #include "bindings/core/v8/ScriptWrappable.h"
 #include "core/html/HTMLImageElement.h"
 #include "core/html/canvas/CanvasImageSource.h"
 #include "platform/geometry/IntRect.h"
 #include "platform/graphics/Image.h"
 #include "platform/heap/Handle.h"
 #include "wtf/PassRefPtr.h"
 #include "wtf/RefCounted.h"
 
 namespace blink {
 
 class HTMLCanvasElement;
 class ImageData;
 
 class ImageBitmap final : public RefCounted<ImageBitmap>, public ScriptWrappable, public ImageLoaderClient, public CanvasImageSource {
     DEFINE_WRAPPERTYPEINFO();
-    WILL_BE_USING_GARBAGE_COLLECTED_MIXIN(ImageBitmap);
 public:
     static PassRefPtr<ImageBitmap> create(HTMLImageElement*, const IntRect&);
     static PassRefPtr<ImageBitmap> create(HTMLCanvasElement*, const IntRect&);
     static PassRefPtr<ImageBitmap> create(ImageData*, const IntRect&);
     static PassRefPtr<ImageBitmap> create(ImageBitmap*, const IntRect&);
     static PassRefPtr<ImageBitmap> create(Image*, const IntRect&);
 
     PassRefPtr<Image> bitmapImage() const;
     PassRefPtr<HTMLImageElement> imageElement() const { return m_imageElement; }
 
@@ skipping 34 matching lines @@
     // The offset by which the desired Image is stored internally.
     // ImageBitmaps constructed from HTMLImageElements reference the entire ImageResource and may have a non-zero bitmap offset.
     // ImageBitmaps not constructed from HTMLImageElements always pre-crop and store the image at (0, 0).
     IntPoint m_bitmapOffset;
 
 };
 
 } // namespace blink
 
 #endif // ImageBitmap_h