Remove image decoder down sampling

Source/core/platform/graphics/Image.cpp

 /*
  * Copyright (C) 2006 Samuel Weinig (sam.weinig@gmail.com)
  * Copyright (C) 2004, 2005, 2006 Apple Computer, Inc.  All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
@@ skipping 165 matching lines @@
         hPhase -= (dstRect.width() - scaledTileWidth) / 2;
     if (vRule == Image::RepeatTile)
         vPhase -= (dstRect.height() - scaledTileHeight) / 2; 
     FloatPoint patternPhase(dstRect.x() - hPhase, dstRect.y() - vPhase);
     
     drawPattern(ctxt, srcRect, patternTransform, patternPhase, styleColorSpace, op, dstRect);
 
     startAnimation();
 }
 
-#if ENABLE(IMAGE_DECODER_DOWN_SAMPLING)
-FloatRect Image::adjustSourceRectForDownSampling(const FloatRect& srcRect, const IntSize& scaledSize) const
-{
-    const IntSize unscaledSize = size();
-    if (unscaledSize == scaledSize)
-        return srcRect;
-
-    // Image has been down-sampled.
-    float xscale = static_cast<float>(scaledSize.width()) / unscaledSize.width();
-    float yscale = static_cast<float>(scaledSize.height()) / unscaledSize.height();
-    FloatRect scaledSrcRect = srcRect;
-    scaledSrcRect.scale(xscale, yscale);
-
-    return scaledSrcRect;
-}
-#endif
-
 void Image::computeIntrinsicDimensions(Length& intrinsicWidth, Length& intrinsicHeight, FloatSize& intrinsicRatio)
 {
     intrinsicRatio = size();
     intrinsicWidth = Length(intrinsicRatio.width(), Fixed);
     intrinsicHeight = Length(intrinsicRatio.height(), Fixed);
 }
 
 void Image::reportMemoryUsage(MemoryObjectInfo* memoryObjectInfo) const
 {
     MemoryClassInfo info(memoryObjectInfo, this, PlatformMemoryTypes::Image);
     memoryObjectInfo->setClassName("Image");
     info.addMember(m_encodedImageData, "encodedImageData");
     info.addWeakPointer(m_imageObserver);
 }
 
 }