Don't cache any SkBitmaps in DeferredImageDecoder

Source/core/fetch/ImageResource.cpp

 /*
     Copyright (C) 1998 Lars Knoll (knoll@mpi-hd.mpg.de)
     Copyright (C) 2001 Dirk Mueller (mueller@kde.org)
     Copyright (C) 2002 Waldo Bastian (bastian@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
@@ skipping 372 matching lines @@
                 memoryCache()->remove(this);
             return;
         }
 
         // It would be nice to only redraw the decoded band of the image, but with the current design
         // (decoding delayed until painting) that seems hard.
         notifyObservers();
     }
 }
 
-void ImageResource::updateBitmapImages(HashSet<ImageResource*>& images, bool redecodeImages)
-{
-    for (ImageResource* imageResource : images) {
-        if (!imageResource->hasImage() || imageResource->image()->isNull())
-            continue;
-        BitmapImage* image = toBitmapImage(imageResource->image());
-        if (redecodeImages)
-            image->resetDecoder();
-        imageResource->updateImage(image->isAllDataReceived());
-    }
-}
-
 void ImageResource::finishOnePart()
 {
     if (m_loadingMultipartContent)
         clear();
     updateImage(true);
     if (m_loadingMultipartContent)
         m_data.clear();
     Resource::finishOnePart();
 }
 
@@ skipping 139 matching lines @@
     if (node && isHTMLImageElement(node)) {
         const AtomicString& urlString = toHTMLImageElement(node)->imageSourceURL();
         KURL url = node->document().completeURL(urlString);
         imageForContainer->setURL(url);
     }
 
     return imageForContainer.get();
 }
 
 } // namespace blink