Don't cache any SkBitmaps in DeferredImageDecoder

Source/core/fetch/ImageResource.h

 /*
     Copyright (C) 1998 Lars Knoll (knoll@mpi-hd.mpg.de)
     Copyright (C) 2001 Dirk Mueller <mueller@kde.org>
     Copyright (C) 2006 Samuel Weinig (sam.weinig@gmail.com)
     Copyright (C) 2004, 2005, 2006, 2007 Apple Inc. All rights reserved.
 
     This library is free software; you can redistribute it and/or
     modify it under the terms of the GNU Library General Public
     License as published by the Free Software Foundation; either
     version 2 of the License, or (at your option) any later version.
@@ skipping 66 matching lines @@
     bool hasDevicePixelRatioHeaderValue() const { return m_hasDevicePixelRatioHeaderValue; }
 
     enum SizeType {
         NormalSize, // Report the size of the image associated with a certain renderer
         IntrinsicSize // Report the intrinsic size, i.e. ignore whatever has been set extrinsically.
     };
     // This method takes a zoom multiplier that can be used to increase the natural size of the image by the zoom.
     LayoutSize imageSizeForRenderer(const LayoutObject*, float multiplier, SizeType = NormalSize); // returns the size of the complete image.
     void computeIntrinsicDimensions(Length& intrinsicWidth, Length& intrinsicHeight, FloatSize& intrinsicRatio);
 
-    static void updateBitmapImages(HashSet<ImageResource*>&, bool redecodeImages = false);
-
     bool isAccessAllowed(ExecutionContext*, SecurityOrigin*);
 
     void updateImageAnimationPolicy();
 
     virtual void didAddClient(ResourceClient*) override;
     virtual void didRemoveClient(ResourceClient*) override;
 
     virtual void allClientsRemoved() override;
 
     virtual void appendData(const char*, unsigned) override;
@@ skipping 44 matching lines @@
     RefPtr<blink::Image> m_image;
     bool m_loadingMultipartContent;
     bool m_hasDevicePixelRatioHeaderValue;
 };
 
 DEFINE_RESOURCE_TYPE_CASTS(Image);
 
 }
 
 #endif